Merge branch 'main' into bugfix_16492_segfault_on_pyfragments

41 files changed, 4078 insertions, 1160 deletions

diff --git a/tools/allocation_tracking/README.md b/tools/allocation_tracking/README.md
index fd4f2c871..6cc4c2a58 100644
--- a/tools/allocation_tracking/README.md
+++ b/tools/allocation_tracking/README.md
@@ -1,11 +1,7 @@
-Example for using the `PyDataMem_SetEventHook` to track allocations inside numpy.
-
-`alloc_hook.pyx` implements a hook in Cython that calls back into a python
-function. `track_allocations.py` uses it for a simple listing of allocations.
-It can be built with the `setup.py` file in this folder.
-
 Note that since Python 3.6 the builtin tracemalloc module can be used to
 track allocations inside numpy.
 Numpy places its CPU memory allocations into the `np.lib.tracemalloc_domain`
 domain.
 See https://docs.python.org/3/library/tracemalloc.html.
+
+The tool that used to be here has been deprecated.
diff --git a/tools/allocation_tracking/alloc_hook.pyx b/tools/allocation_tracking/alloc_hook.pyx
deleted file mode 100644
index eeefe1704..000000000
--- a/tools/allocation_tracking/alloc_hook.pyx
+++ /dev/null
@@ -1,42 +0,0 @@
-# A cython wrapper for using python functions as callbacks for
-# PyDataMem_SetEventHook.
-
-cimport numpy as np
-
-cdef extern from "Python.h":
-    object PyLong_FromVoidPtr(void *)
-    void *PyLong_AsVoidPtr(object)
-
-ctypedef void PyDataMem_EventHookFunc(void *inp, void *outp, size_t size,
-                                      void *user_data)
-cdef extern from "numpy/arrayobject.h":
-    PyDataMem_EventHookFunc * \
-        PyDataMem_SetEventHook(PyDataMem_EventHookFunc *newhook,
-                               void *user_data, void **old_data)
-
-np.import_array()
-
-cdef void pyhook(void *old, void *new, size_t size, void *user_data):
-    cdef object pyfunc = <object> user_data
-    pyfunc(PyLong_FromVoidPtr(old),
-           PyLong_FromVoidPtr(new),
-           size)
-
-class NumpyAllocHook:
-    def __init__(self, callback):
-        self.callback = callback
-
-    def __enter__(self):
-        cdef void *old_hook, *old_data
-        old_hook = <void *> \
-            PyDataMem_SetEventHook(<PyDataMem_EventHookFunc *> pyhook,
-                                    <void *> self.callback,
-                                    <void **> &old_data)
-        self.old_hook = PyLong_FromVoidPtr(old_hook)
-        self.old_data = PyLong_FromVoidPtr(old_data)
-
-    def __exit__(self):
-        PyDataMem_SetEventHook(<PyDataMem_EventHookFunc *> \
-                                    PyLong_AsVoidPtr(self.old_hook),
-                                <void *> PyLong_AsVoidPtr(self.old_data),
-                                <void **> 0)
diff --git a/tools/allocation_tracking/setup.py b/tools/allocation_tracking/setup.py
deleted file mode 100644
index 4462f9f4e..000000000
--- a/tools/allocation_tracking/setup.py
+++ /dev/null
@@ -1,9 +0,0 @@
-from distutils.core import setup
-from distutils.extension import Extension
-from Cython.Distutils import build_ext
-import numpy
-
-setup(
-    cmdclass = {'build_ext': build_ext},
-    ext_modules = [Extension("alloc_hook", ["alloc_hook.pyx"],
-                             include_dirs=[numpy.get_include()])])
diff --git a/tools/allocation_tracking/sorttable.js b/tools/allocation_tracking/sorttable.js
deleted file mode 100644
index c9528873e..000000000
--- a/tools/allocation_tracking/sorttable.js
+++ /dev/null
@@ -1,493 +0,0 @@
-/*
-  SortTable
-  version 2
-  7th April 2007
-  Stuart Langridge, https://www.kryogenix.org/code/browser/sorttable/
-  
-  Instructions:
-  Download this file
-  Add <script src="sorttable.js"></script> to your HTML
-  Add class="sortable" to any table you'd like to make sortable
-  Click on the headers to sort
-  
-  Thanks to many, many people for contributions and suggestions.
-  Licenced as X11: https://www.kryogenix.org/code/browser/licence.html
-  This basically means: do what you want with it.
-*/
-
- 
-var stIsIE = /*@cc_on!@*/false;
-
-sorttable = {
-  init: function() {
-    // quit if this function has already been called
-    if (arguments.callee.done) return;
-    // flag this function so we don't do the same thing twice
-    arguments.callee.done = true;
-    // kill the timer
-    if (_timer) clearInterval(_timer);
-    
-    if (!document.createElement || !document.getElementsByTagName) return;
-    
-    sorttable.DATE_RE = /^(\d\d?)[\/\.-](\d\d?)[\/\.-]((\d\d)?\d\d)$/;
-    
-    forEach(document.getElementsByTagName('table'), function(table) {
-      if (table.className.search(/\bsortable\b/) != -1) {
-        sorttable.makeSortable(table);
-      }
-    });
-    
-  },
-  
-  makeSortable: function(table) {
-    if (table.getElementsByTagName('thead').length == 0) {
-      // table doesn't have a tHead. Since it should have, create one and
-      // put the first table row in it.
-      the = document.createElement('thead');
-      the.appendChild(table.rows[0]);
-      table.insertBefore(the,table.firstChild);
-    }
-    // Safari doesn't support table.tHead, sigh
-    if (table.tHead == null) table.tHead = table.getElementsByTagName('thead')[0];
-    
-    if (table.tHead.rows.length != 1) return; // can't cope with two header rows
-    
-    // Sorttable v1 put rows with a class of "sortbottom" at the bottom (as
-    // "total" rows, for example). This is B&R, since what you're supposed
-    // to do is put them in a tfoot. So, if there are sortbottom rows,
-    // for backwards compatibility, move them to tfoot (creating it if needed).
-    sortbottomrows = [];
-    for (var i=0; i<table.rows.length; i++) {
-      if (table.rows[i].className.search(/\bsortbottom\b/) != -1) {
-        sortbottomrows[sortbottomrows.length] = table.rows[i];
-      }
-    }
-    if (sortbottomrows) {
-      if (table.tFoot == null) {
-        // table doesn't have a tfoot. Create one.
-        tfo = document.createElement('tfoot');
-        table.appendChild(tfo);
-      }
-      for (var i=0; i<sortbottomrows.length; i++) {
-        tfo.appendChild(sortbottomrows[i]);
-      }
-      delete sortbottomrows;
-    }
-    
-    // work through each column and calculate its type
-    headrow = table.tHead.rows[0].cells;
-    for (var i=0; i<headrow.length; i++) {
-      // manually override the type with a sorttable_type attribute
-      if (!headrow[i].className.match(/\bsorttable_nosort\b/)) { // skip this col
-        mtch = headrow[i].className.match(/\bsorttable_([a-z0-9]+)\b/);
-        if (mtch) { override = mtch[1]; }
-	      if (mtch && typeof sorttable["sort_"+override] == 'function') {
-	        headrow[i].sorttable_sortfunction = sorttable["sort_"+override];
-	      } else {
-	        headrow[i].sorttable_sortfunction = sorttable.guessType(table,i);
-	      }
-	      // make it clickable to sort
-	      headrow[i].sorttable_columnindex = i;
-	      headrow[i].sorttable_tbody = table.tBodies[0];
-	      dean_addEvent(headrow[i],"click", function(e) {
-
-          if (this.className.search(/\bsorttable_sorted\b/) != -1) {
-            // if we're already sorted by this column, just 
-            // reverse the table, which is quicker
-            sorttable.reverse(this.sorttable_tbody);
-            this.className = this.className.replace('sorttable_sorted',
-                                                    'sorttable_sorted_reverse');
-            this.removeChild(document.getElementById('sorttable_sortfwdind'));
-            sortrevind = document.createElement('span');
-            sortrevind.id = "sorttable_sortrevind";
-            sortrevind.innerHTML = stIsIE ? '&nbsp<font face="webdings">5</font>' : '&nbsp;&#x25B4;';
-            this.appendChild(sortrevind);
-            return;
-          }
-          if (this.className.search(/\bsorttable_sorted_reverse\b/) != -1) {
-            // if we're already sorted by this column in reverse, just 
-            // re-reverse the table, which is quicker
-            sorttable.reverse(this.sorttable_tbody);
-            this.className = this.className.replace('sorttable_sorted_reverse',
-                                                    'sorttable_sorted');
-            this.removeChild(document.getElementById('sorttable_sortrevind'));
-            sortfwdind = document.createElement('span');
-            sortfwdind.id = "sorttable_sortfwdind";
-            sortfwdind.innerHTML = stIsIE ? '&nbsp<font face="webdings">6</font>' : '&nbsp;&#x25BE;';
-            this.appendChild(sortfwdind);
-            return;
-          }
-          
-          // remove sorttable_sorted classes
-          theadrow = this.parentNode;
-          forEach(theadrow.childNodes, function(cell) {
-            if (cell.nodeType == 1) { // an element
-              cell.className = cell.className.replace('sorttable_sorted_reverse','');
-              cell.className = cell.className.replace('sorttable_sorted','');
-            }
-          });
-          sortfwdind = document.getElementById('sorttable_sortfwdind');
-          if (sortfwdind) { sortfwdind.parentNode.removeChild(sortfwdind); }
-          sortrevind = document.getElementById('sorttable_sortrevind');
-          if (sortrevind) { sortrevind.parentNode.removeChild(sortrevind); }
-          
-          this.className += ' sorttable_sorted';
-          sortfwdind = document.createElement('span');
-          sortfwdind.id = "sorttable_sortfwdind";
-          sortfwdind.innerHTML = stIsIE ? '&nbsp<font face="webdings">6</font>' : '&nbsp;&#x25BE;';
-          this.appendChild(sortfwdind);
-
-	        // build an array to sort. This is a Schwartzian transform thing,
-	        // i.e., we "decorate" each row with the actual sort key,
-	        // sort based on the sort keys, and then put the rows back in order
-	        // which is a lot faster because you only do getInnerText once per row
-	        row_array = [];
-	        col = this.sorttable_columnindex;
-	        rows = this.sorttable_tbody.rows;
-	        for (var j=0; j<rows.length; j++) {
-	          row_array[row_array.length] = [sorttable.getInnerText(rows[j].cells[col]), rows[j]];
-	        }
-	        /* If you want a stable sort, uncomment the following line */
-	        //sorttable.shaker_sort(row_array, this.sorttable_sortfunction);
-	        /* and comment out this one */
-	        row_array.sort(this.sorttable_sortfunction);
-	        
-	        tb = this.sorttable_tbody;
-	        for (var j=0; j<row_array.length; j++) {
-	          tb.appendChild(row_array[j][1]);
-	        }
-	        
-	        delete row_array;
-	      });
-	    }
-    }
-  },
-  
-  guessType: function(table, column) {
-    // guess the type of a column based on its first non-blank row
-    sortfn = sorttable.sort_alpha;
-    for (var i=0; i<table.tBodies[0].rows.length; i++) {
-      text = sorttable.getInnerText(table.tBodies[0].rows[i].cells[column]);
-      if (text != '') {
-        if (text.match(/^-?[£$¤]?[\d,.]+%?$/)) {
-          return sorttable.sort_numeric;
-        }
-        // check for a date: dd/mm/yyyy or dd/mm/yy 
-        // can have / or . or - as separator
-        // can be mm/dd as well
-        possdate = text.match(sorttable.DATE_RE)
-        if (possdate) {
-          // looks like a date
-          first = parseInt(possdate[1]);
-          second = parseInt(possdate[2]);
-          if (first > 12) {
-            // definitely dd/mm
-            return sorttable.sort_ddmm;
-          } else if (second > 12) {
-            return sorttable.sort_mmdd;
-          } else {
-            // looks like a date, but we can't tell which, so assume
-            // that it's dd/mm (English imperialism!) and keep looking
-            sortfn = sorttable.sort_ddmm;
-          }
-        }
-      }
-    }
-    return sortfn;
-  },
-  
-  getInnerText: function(node) {
-    // gets the text we want to use for sorting for a cell.
-    // strips leading and trailing whitespace.
-    // this is *not* a generic getInnerText function; it's special to sorttable.
-    // for example, you can override the cell text with a customkey attribute.
-    // it also gets .value for <input> fields.
-    
-    hasInputs = (typeof node.getElementsByTagName == 'function') &&
-                 node.getElementsByTagName('input').length;
-    
-    if (node.getAttribute("sorttable_customkey") != null) {
-      return node.getAttribute("sorttable_customkey");
-    }
-    else if (typeof node.textContent != 'undefined' && !hasInputs) {
-      return node.textContent.replace(/^\s+|\s+$/g, '');
-    }
-    else if (typeof node.innerText != 'undefined' && !hasInputs) {
-      return node.innerText.replace(/^\s+|\s+$/g, '');
-    }
-    else if (typeof node.text != 'undefined' && !hasInputs) {
-      return node.text.replace(/^\s+|\s+$/g, '');
-    }
-    else {
-      switch (node.nodeType) {
-        case 3:
-          if (node.nodeName.toLowerCase() == 'input') {
-            return node.value.replace(/^\s+|\s+$/g, '');
-          }
-        case 4:
-          return node.nodeValue.replace(/^\s+|\s+$/g, '');
-          break;
-        case 1:
-        case 11:
-          var innerText = '';
-          for (var i = 0; i < node.childNodes.length; i++) {
-            innerText += sorttable.getInnerText(node.childNodes[i]);
-          }
-          return innerText.replace(/^\s+|\s+$/g, '');
-          break;
-        default:
-          return '';
-      }
-    }
-  },
-  
-  reverse: function(tbody) {
-    // reverse the rows in a tbody
-    newrows = [];
-    for (var i=0; i<tbody.rows.length; i++) {
-      newrows[newrows.length] = tbody.rows[i];
-    }
-    for (var i=newrows.length-1; i>=0; i--) {
-       tbody.appendChild(newrows[i]);
-    }
-    delete newrows;
-  },
-  
-  /* sort functions
-     each sort function takes two parameters, a and b
-     you are comparing a[0] and b[0] */
-  sort_numeric: function(a,b) {
-    aa = parseFloat(a[0].replace(/[^0-9.-]/g,''));
-    if (isNaN(aa)) aa = 0;
-    bb = parseFloat(b[0].replace(/[^0-9.-]/g,'')); 
-    if (isNaN(bb)) bb = 0;
-    return aa-bb;
-  },
-  sort_alpha: function(a,b) {
-    if (a[0]==b[0]) return 0;
-    if (a[0]<b[0]) return -1;
-    return 1;
-  },
-  sort_ddmm: function(a,b) {
-    mtch = a[0].match(sorttable.DATE_RE);
-    y = mtch[3]; m = mtch[2]; d = mtch[1];
-    if (m.length == 1) m = '0'+m;
-    if (d.length == 1) d = '0'+d;
-    dt1 = y+m+d;
-    mtch = b[0].match(sorttable.DATE_RE);
-    y = mtch[3]; m = mtch[2]; d = mtch[1];
-    if (m.length == 1) m = '0'+m;
-    if (d.length == 1) d = '0'+d;
-    dt2 = y+m+d;
-    if (dt1==dt2) return 0;
-    if (dt1<dt2) return -1;
-    return 1;
-  },
-  sort_mmdd: function(a,b) {
-    mtch = a[0].match(sorttable.DATE_RE);
-    y = mtch[3]; d = mtch[2]; m = mtch[1];
-    if (m.length == 1) m = '0'+m;
-    if (d.length == 1) d = '0'+d;
-    dt1 = y+m+d;
-    mtch = b[0].match(sorttable.DATE_RE);
-    y = mtch[3]; d = mtch[2]; m = mtch[1];
-    if (m.length == 1) m = '0'+m;
-    if (d.length == 1) d = '0'+d;
-    dt2 = y+m+d;
-    if (dt1==dt2) return 0;
-    if (dt1<dt2) return -1;
-    return 1;
-  },
-  
-  shaker_sort: function(list, comp_func) {
-    // A stable sort function to allow multi-level sorting of data
-    // see: https://en.wikipedia.org/wiki/Cocktail_shaker_sort
-    // thanks to Joseph Nahmias
-    var b = 0;
-    var t = list.length - 1;
-    var swap = true;
-
-    while(swap) {
-        swap = false;
-        for(var i = b; i < t; ++i) {
-            if ( comp_func(list[i], list[i+1]) > 0 ) {
-                var q = list[i]; list[i] = list[i+1]; list[i+1] = q;
-                swap = true;
-            }
-        } // for
-        t--;
-
-        if (!swap) break;
-
-        for(var i = t; i > b; --i) {
-            if ( comp_func(list[i], list[i-1]) < 0 ) {
-                var q = list[i]; list[i] = list[i-1]; list[i-1] = q;
-                swap = true;
-            }
-        } // for
-        b++;
-
-    } // while(swap)
-  }  
-}
-
-/* ******************************************************************
-   Supporting functions: bundled here to avoid depending on a library
-   ****************************************************************** */
-
-// Dean Edwards/Matthias Miller/John Resig
-
-/* for Mozilla/Opera9 */
-if (document.addEventListener) {
-    document.addEventListener("DOMContentLoaded", sorttable.init, false);
-}
-
-/* for Internet Explorer */
-/*@cc_on @*/
-/*@if (@_win32)
-    document.write("<script id=__ie_onload defer src=javascript:void(0)><\/script>");
-    var script = document.getElementById("__ie_onload");
-    script.onreadystatechange = function() {
-        if (this.readyState == "complete") {
-            sorttable.init(); // call the onload handler
-        }
-    };
-/*@end @*/
-
-/* for Safari */
-if (/WebKit/i.test(navigator.userAgent)) { // sniff
-    var _timer = setInterval(function() {
-        if (/loaded|complete/.test(document.readyState)) {
-            sorttable.init(); // call the onload handler
-        }
-    }, 10);
-}
-
-/* for other browsers */
-window.onload = sorttable.init;
-
-// written by Dean Edwards, 2005
-// with input from Tino Zijdel, Matthias Miller, Diego Perini
-
-// http://dean.edwards.name/weblog/2005/10/add-event/
-
-function dean_addEvent(element, type, handler) {
-	if (element.addEventListener) {
-		element.addEventListener(type, handler, false);
-	} else {
-		// assign each event handler a unique ID
-		if (!handler.$$guid) handler.$$guid = dean_addEvent.guid++;
-		// create a hash table of event types for the element
-		if (!element.events) element.events = {};
-		// create a hash table of event handlers for each element/event pair
-		var handlers = element.events[type];
-		if (!handlers) {
-			handlers = element.events[type] = {};
-			// store the existing event handler (if there is one)
-			if (element["on" + type]) {
-				handlers[0] = element["on" + type];
-			}
-		}
-		// store the event handler in the hash table
-		handlers[handler.$$guid] = handler;
-		// assign a global event handler to do all the work
-		element["on" + type] = handleEvent;
-	}
-};
-// a counter used to create unique IDs
-dean_addEvent.guid = 1;
-
-function removeEvent(element, type, handler) {
-	if (element.removeEventListener) {
-		element.removeEventListener(type, handler, false);
-	} else {
-		// delete the event handler from the hash table
-		if (element.events && element.events[type]) {
-			delete element.events[type][handler.$$guid];
-		}
-	}
-};
-
-function handleEvent(event) {
-	var returnValue = true;
-	// grab the event object (IE uses a global event object)
-	event = event || fixEvent(((this.ownerDocument || this.document || this).parentWindow || window).event);
-	// get a reference to the hash table of event handlers
-	var handlers = this.events[event.type];
-	// execute each event handler
-	for (var i in handlers) {
-		this.$$handleEvent = handlers[i];
-		if (this.$$handleEvent(event) === false) {
-			returnValue = false;
-		}
-	}
-	return returnValue;
-};
-
-function fixEvent(event) {
-	// add W3C standard event methods
-	event.preventDefault = fixEvent.preventDefault;
-	event.stopPropagation = fixEvent.stopPropagation;
-	return event;
-};
-fixEvent.preventDefault = function() {
-	this.returnValue = false;
-};
-fixEvent.stopPropagation = function() {
-  this.cancelBubble = true;
-}
-
-// Dean's forEach: http://dean.edwards.name/base/forEach.js
-/*
-	forEach, version 1.0
-	Copyright 2006, Dean Edwards
-	License: https://www.opensource.org/licenses/mit-license.php
-*/
-
-// array-like enumeration
-if (!Array.forEach) { // mozilla already supports this
-	Array.forEach = function(array, block, context) {
-		for (var i = 0; i < array.length; i++) {
-			block.call(context, array[i], i, array);
-		}
-	};
-}
-
-// generic enumeration
-Function.prototype.forEach = function(object, block, context) {
-	for (var key in object) {
-		if (typeof this.prototype[key] == "undefined") {
-			block.call(context, object[key], key, object);
-		}
-	}
-};
-
-// character enumeration
-String.forEach = function(string, block, context) {
-	Array.forEach(string.split(""), function(chr, index) {
-		block.call(context, chr, index, string);
-	});
-};
-
-// globally resolve forEach enumeration
-var forEach = function(object, block, context) {
-	if (object) {
-		var resolve = Object; // default
-		if (object instanceof Function) {
-			// functions have a "length" property
-			resolve = Function;
-		} else if (object.forEach instanceof Function) {
-			// the object implements a custom forEach method so use that
-			object.forEach(block, context);
-			return;
-		} else if (typeof object == "string") {
-			// the object is a string
-			resolve = String;
-		} else if (typeof object.length == "number") {
-			// the object is array-like
-			resolve = Array;
-		}
-		resolve.forEach(object, block, context);
-	}
-};
-
diff --git a/tools/allocation_tracking/track_allocations.py b/tools/allocation_tracking/track_allocations.py
deleted file mode 100644
index 2a80d8f87..000000000
--- a/tools/allocation_tracking/track_allocations.py
+++ /dev/null
@@ -1,140 +0,0 @@
-import numpy as np
-import gc
-import inspect
-from alloc_hook import NumpyAllocHook
-
-class AllocationTracker:
-    def __init__(self, threshold=0):
-        '''track numpy allocations of size threshold bytes or more.'''
-
-        self.threshold = threshold
-
-        # The total number of bytes currently allocated with size above
-        # threshold
-        self.total_bytes = 0
-
-        # We buffer requests line by line and move them into the allocation
-        # trace when a new line occurs
-        self.current_line = None
-        self.pending_allocations = []
-
-        self.blocksizes = {}
-
-        # list of (lineinfo, bytes allocated, bytes freed, # allocations, #
-        # frees, maximum memory usage, long-lived bytes allocated)
-        self.allocation_trace = []
-
-        self.numpy_hook = NumpyAllocHook(self.hook)
-
-    def __enter__(self):
-        self.numpy_hook.__enter__()
-
-    def __exit__(self, type, value, traceback):
-        self.check_line_changed()  # forces pending events to be handled
-        self.numpy_hook.__exit__()
-
-    def hook(self, inptr, outptr, size):
-        # minimize the chances that the garbage collector kicks in during a
-        # cython __dealloc__ call and causes a double delete of the current
-        # object. To avoid this fully the hook would have to avoid all python
-        # api calls, e.g. by being implemented in C like python 3.4's
-        # tracemalloc module
-        gc_on = gc.isenabled()
-        gc.disable()
-        if outptr == 0:  # it's a free
-            self.free_cb(inptr)
-        elif inptr != 0:  # realloc
-            self.realloc_cb(inptr, outptr, size)
-        else:  # malloc
-            self.alloc_cb(outptr, size)
-        if gc_on:
-            gc.enable()
-
-    def alloc_cb(self, ptr, size):
-        if size >= self.threshold:
-            self.check_line_changed()
-            self.blocksizes[ptr] = size
-            self.pending_allocations.append(size)
-
-    def free_cb(self, ptr):
-        size = self.blocksizes.pop(ptr, 0)
-        if size:
-            self.check_line_changed()
-            self.pending_allocations.append(-size)
-
-    def realloc_cb(self, newptr, oldptr, size):
-        if (size >= self.threshold) or (oldptr in self.blocksizes):
-            self.check_line_changed()
-            oldsize = self.blocksizes.pop(oldptr, 0)
-            self.pending_allocations.append(size - oldsize)
-            self.blocksizes[newptr] = size
-
-    def get_code_line(self):
-        # first frame is this line, then check_line_changed(), then 2 callbacks,
-        # then actual code.
-        try:
-            return inspect.stack()[4][1:]
-        except Exception:
-            return inspect.stack()[0][1:]
-
-    def check_line_changed(self):
-        line = self.get_code_line()
-        if line != self.current_line and (self.current_line is not None):
-            # move pending events into the allocation_trace
-            max_size = self.total_bytes
-            bytes_allocated = 0
-            bytes_freed = 0
-            num_allocations = 0
-            num_frees = 0
-            before_size = self.total_bytes
-            for allocation in self.pending_allocations:
-                self.total_bytes += allocation
-                if allocation > 0:
-                    bytes_allocated += allocation
-                    num_allocations += 1
-                else:
-                    bytes_freed += -allocation
-                    num_frees += 1
-                max_size = max(max_size, self.total_bytes)
-            long_lived = max(self.total_bytes - before_size, 0)
-            self.allocation_trace.append((self.current_line, bytes_allocated,
-                                          bytes_freed, num_allocations,
-                                          num_frees, max_size, long_lived))
-            # clear pending allocations
-            self.pending_allocations = []
-        # move to the new line
-        self.current_line = line
-
-    def write_html(self, filename):
-        with open(filename, "w") as f:
-            f.write('<HTML><HEAD><script src="sorttable.js"></script></HEAD><BODY>\n')
-            f.write('<TABLE class="sortable" width=100%>\n')
-            f.write("<TR>\n")
-            cols = "event#,lineinfo,bytes allocated,bytes freed,#allocations,#frees,max memory usage,long lived bytes".split(',')
-            for header in cols:
-                f.write("  <TH>{0}</TH>".format(header))
-            f.write("\n</TR>\n")
-            for idx, event in enumerate(self.allocation_trace):
-                f.write("<TR>\n")
-                event = [idx] + list(event)
-                for col, val in zip(cols, event):
-                    if col == 'lineinfo':
-                        # special handling
-                        try:
-                            filename, line, module, code, index = val
-                            val = "{0}({1}): {2}".format(filename, line, code[index])
-                        except Exception:
-                            # sometimes this info is not available (from eval()?)
-                            val = str(val)
-                    f.write("  <TD>{0}</TD>".format(val))
-                f.write("\n</TR>\n")
-            f.write("</TABLE></BODY></HTML>\n")
-
-
-if __name__ == '__main__':
-    tracker = AllocationTracker(1000)
-    with tracker:
-        for i in range(100):
-            np.zeros(i * 100)
-            np.zeros(i * 200)
-    tracker.write_html("allocations.html")
diff --git a/tools/changelog.py b/tools/changelog.py
index 92f33af24..7b7e66ddb 100755
--- a/tools/changelog.py
+++ b/tools/changelog.py
@@ -1,5 +1,4 @@
 #!/usr/bin/env python3
-# -*- encoding:utf-8 -*-
 """
 Script to generate contributor and pull request lists
 
@@ -22,6 +21,7 @@ Dependencies
 
 - gitpython
 - pygithub
+- git >= 2.29.0
 
 Some code was copied from scipy `tools/gh_list.py` and `tools/authors.py`.
 
@@ -39,38 +39,44 @@ import re
 from git import Repo
 from github import Github
 
-if sys.version_info[:2] < (3, 6):
-    raise RuntimeError("Python version must be >= 3.6")
-
 this_repo = Repo(os.path.join(os.path.dirname(__file__), ".."))
 
 author_msg =\
-u"""
+"""
 A total of %d people contributed to this release.  People with a "+" by their
 names contributed a patch for the first time.
 """
 
 pull_request_msg =\
-u"""
+"""
 A total of %d pull requests were merged for this release.
 """
 
+
 def get_authors(revision_range):
-    pat = u'^.*\\t(.*)$'
     lst_release, cur_release = [r.strip() for r in revision_range.split('..')]
+    authors_pat = r'^.*\t(.*)$'
+
+    # authors and co-authors in current and previous releases.
+    grp1 = '--group=author'
+    grp2 = '--group=trailer:co-authored-by'
+    cur = this_repo.git.shortlog('-s', grp1, grp2, revision_range)
+    pre = this_repo.git.shortlog('-s', grp1, grp2, lst_release)
+    authors_cur = set(re.findall(authors_pat, cur, re.M))
+    authors_pre = set(re.findall(authors_pat, pre, re.M))
 
-    # authors, in current release and previous to current release.
-    cur = set(re.findall(pat, this_repo.git.shortlog('-s', revision_range),
-                         re.M))
-    pre = set(re.findall(pat, this_repo.git.shortlog('-s', lst_release),
-                         re.M))
+    # Ignore the bot Homu.
+    authors_cur.discard('Homu')
+    authors_pre.discard('Homu')
 
-    # Homu is the author of auto merges, clean him out.
-    cur.discard('Homu')
-    pre.discard('Homu')
+    # Ignore the bot dependabot-preview
+    authors_cur.discard('dependabot-preview')
+    authors_pre.discard('dependabot-preview')
 
     # Append '+' to new authors.
-    authors = [s + u' +' for s in cur - pre] + [s for s in cur & pre]
+    authors_new = [s + ' +' for s in authors_cur - authors_pre]
+    authors_old = [s for s in authors_cur & authors_pre]
+    authors = authors_new + authors_old
     authors.sort()
     return authors
 
@@ -81,18 +87,18 @@ def get_pull_requests(repo, revision_range):
     # From regular merges
     merges = this_repo.git.log(
         '--oneline', '--merges', revision_range)
-    issues = re.findall(u"Merge pull request \\#(\\d*)", merges)
+    issues = re.findall(r"Merge pull request \#(\d*)", merges)
     prnums.extend(int(s) for s in issues)
 
     # From Homu merges (Auto merges)
-    issues = re. findall(u"Auto merge of \\#(\\d*)", merges)
+    issues = re. findall(r"Auto merge of \#(\d*)", merges)
     prnums.extend(int(s) for s in issues)
 
     # From fast forward squash-merges
     commits = this_repo.git.log(
         '--oneline', '--no-merges', '--first-parent', revision_range)
-    issues = re.findall(u'^.*\\(\\#(\\d+)\\)$', commits, re.M)
-    prnums.extend(int(s) for s in issues)
+    issues = re.findall(r'^.*\((\#|gh-|gh-\#)(\d+)\)$', commits, re.M)
+    prnums.extend(int(s[1]) for s in issues)
 
     # get PR data from github repo
     prnums.sort()
@@ -108,31 +114,31 @@ def main(token, revision_range):
 
     # document authors
     authors = get_authors(revision_range)
-    heading = u"Contributors"
+    heading = "Contributors"
     print()
     print(heading)
-    print(u"="*len(heading))
+    print("="*len(heading))
     print(author_msg % len(authors))
 
     for s in authors:
-        print(u'* ' + s)
+        print('* ' + s)
 
     # document pull requests
     pull_requests = get_pull_requests(github_repo, revision_range)
-    heading = u"Pull requests merged"
-    pull_msg = u"* `#{0} <{1}>`__: {2}"
+    heading = "Pull requests merged"
+    pull_msg = "* `#{0} <{1}>`__: {2}"
 
     print()
     print(heading)
-    print(u"="*len(heading))
+    print("="*len(heading))
     print(pull_request_msg % len(pull_requests))
 
     for pull in pull_requests:
-        title = re.sub(u"\\s+", u" ", pull.title.strip())
+        title = re.sub(r"\s+", " ", pull.title.strip())
         if len(title) > 60:
-            remainder = re.sub(u"\\s.*$", u"...", title[60:])
+            remainder = re.sub(r"\s.*$", "...", title[60:])
             if len(remainder) > 20:
-                remainder = title[:80] + u"..."
+                remainder = title[:80] + "..."
             else:
                 title = title[:60] + remainder
         print(pull_msg.format(pull.number, pull.html_url, title))
diff --git a/tools/ci/push_docs_to_repo.py b/tools/ci/push_docs_to_repo.py
index ae5305484..058f748ec 100755
--- a/tools/ci/push_docs_to_repo.py
+++ b/tools/ci/push_docs_to_repo.py
@@ -45,6 +45,9 @@ workdir = tempfile.mkdtemp()
 os.chdir(workdir)
 
 run(['git', 'init'])
+# ensure the working branch is called "main"
+# (`--initial-branch=main` appared to have failed on older git versions):
+run(['git', 'checkout', '-b', 'main'])
 run(['git', 'remote', 'add', 'origin',  args.remote])
 run(['git', 'config', '--local', 'user.name', args.committer])
 run(['git', 'config', '--local', 'user.email', args.email])
@@ -56,7 +59,7 @@ run(['git', 'commit', '--allow-empty', '-m', args.message], stdout=False)
 
 print('- uploading as %s <%s>' % (args.committer, args.email))
 if args.force:
-    run(['git', 'push', 'origin', 'master', '--force'])
+    run(['git', 'push', 'origin', 'main', '--force'])
 else:
     print('\n!! No `--force` argument specified; aborting')
     print('!! Before enabling that flag, make sure you know what it does\n')
diff --git a/tools/ci/test_all_newsfragments_used.py b/tools/ci/test_all_newsfragments_used.py
index c2e031549..62c9a05f9 100755
--- a/tools/ci/test_all_newsfragments_used.py
+++ b/tools/ci/test_all_newsfragments_used.py
@@ -12,5 +12,5 @@ fragments.remove("template.rst")
 
 if fragments:
     print("The following files were not found by towncrier:")
-    print("    " + "    \n".join(fragments))
+    print("    " + "\n    ".join(fragments))
     sys.exit(1)
diff --git a/tools/commitstats.py b/tools/commitstats.py
index 14c37d4d2..534f0a1b8 100644
--- a/tools/commitstats.py
+++ b/tools/commitstats.py
@@ -4,7 +4,7 @@ import re
 import numpy as np
 import os
 
-names = re.compile(r'r\d+\s[|]\s(.*)\s[|]\s200')
+names = re.compile(r'r\d+\s\|\s(.*)\s\|\s200')
 
 def get_count(filename, repo):
     mystr = open(filename).read()
diff --git a/tools/cythonize.py b/tools/cythonize.py
index 65b79f716..002b2fad7 100755
--- a/tools/cythonize.py
+++ b/tools/cythonize.py
@@ -40,12 +40,6 @@ HASH_FILE = 'cythonize.dat'
 DEFAULT_ROOT = 'numpy'
 VENDOR = 'NumPy'
 
-# WindowsError is not defined on unix systems
-try:
-    WindowsError
-except NameError:
-    WindowsError = None
-
 #
 # Rules
 #
@@ -54,28 +48,8 @@ def process_pyx(fromfile, tofile):
     if tofile.endswith('.cxx'):
         flags.append('--cplus')
 
-    try:
-        # try the cython in the installed python first (somewhat related to scipy/scipy#2397)
-        from Cython.Compiler.Version import version as cython_version
-    except ImportError:
-        # The `cython` command need not point to the version installed in the
-        # Python running this script, so raise an error to avoid the chance of
-        # using the wrong version of Cython.
-        raise OSError('Cython needs to be installed in Python as a module')
-    else:
-        # check the version, and invoke through python
-        from distutils.version import LooseVersion
-
-        # Cython 0.29.14 is required for Python 3.8 and there are
-        # other fixes in the 0.29 series that are needed even for earlier
-        # Python versions.
-        # Note: keep in sync with that in pyproject.toml
-        required_version = LooseVersion('0.29.14')
-
-        if LooseVersion(cython_version) < required_version:
-            raise RuntimeError(f'Building {VENDOR} requires Cython >= {required_version}')
-        subprocess.check_call(
-            [sys.executable, '-m', 'cython'] + flags + ["-o", tofile, fromfile])
+    subprocess.check_call(
+        [sys.executable, '-m', 'cython'] + flags + ["-o", tofile, fromfile])
 
 
 def process_tempita_pyx(fromfile, tofile):
@@ -136,7 +110,7 @@ rules = {
 # Hash db
 #
 def load_hashes(filename):
-    # Return { filename : (sha1 of input, sha1 of output) }
+    # Return { filename : (sha256 of input, sha256 of output) }
     if os.path.isfile(filename):
         hashes = {}
         with open(filename, 'r') as f:
@@ -152,8 +126,8 @@ def save_hashes(hash_db, filename):
         for key, value in sorted(hash_db.items()):
             f.write("%s %s %s\n" % (key, value[0], value[1]))
 
-def sha1_of_file(filename):
-    h = hashlib.sha1()
+def sha256_of_file(filename):
+    h = hashlib.sha256()
     with open(filename, "rb") as f:
         h.update(f.read())
     return h.hexdigest()
@@ -169,8 +143,8 @@ def normpath(path):
     return path
 
 def get_hash(frompath, topath):
-    from_hash = sha1_of_file(frompath)
-    to_hash = sha1_of_file(topath) if os.path.exists(topath) else None
+    from_hash = sha256_of_file(frompath)
+    to_hash = sha256_of_file(topath) if os.path.exists(topath) else None
     return (from_hash, to_hash)
 
 def process(path, fromfile, tofile, processor_function, hash_db):
diff --git a/tools/download-wheels.py b/tools/download-wheels.py
index 941440ca9..41e1e9e5d 100644
--- a/tools/download-wheels.py
+++ b/tools/download-wheels.py
@@ -1,9 +1,28 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 """
-Download NumPy wheels from Anaconda staging area.
+Script to download NumPy wheels from the Anaconda staging area.
+
+Usage::
+
+    $ ./tools/download-wheels.py <version> -w <optional-wheelhouse>
+
+The default wheelhouse is ``release/installers``.
+
+Dependencies
+------------
+
+- beautifulsoup4
+- urllib3
+
+Examples
+--------
+
+While in the repository root::
+
+    $ python tools/download-wheels.py 1.19.0
+    $ python tools/download-wheels.py 1.19.0 -w ~/wheelhouse
 
 """
-import sys
 import os
 import re
 import shutil
@@ -12,11 +31,18 @@ import argparse
 import urllib3
 from bs4 import BeautifulSoup
 
-__version__ = '0.1'
+__version__ = "0.1"
 
 # Edit these for other projects.
-STAGING_URL = 'https://anaconda.org/multibuild-wheels-staging/numpy'
-PREFIX = 'numpy'
+STAGING_URL = "https://anaconda.org/multibuild-wheels-staging/numpy"
+PREFIX = "numpy"
+
+# Name endings of the files to download.
+WHL = r"-.*\.whl$"
+ZIP = r"\.zip$"
+GZIP = r"\.tar\.gz$"
+SUFFIX = rf"({WHL}|{GZIP}|{ZIP})"
+
 
 def get_wheel_names(version):
     """ Get wheel names from Anaconda HTML directory.
@@ -30,11 +56,11 @@ def get_wheel_names(version):
         The release version. For instance, "1.18.3".
 
     """
-    http = urllib3.PoolManager(cert_reqs='CERT_REQUIRED')
-    tmpl = re.compile(rf"^.*{PREFIX}-{version}-.*\.whl$")
+    http = urllib3.PoolManager(cert_reqs="CERT_REQUIRED")
+    tmpl = re.compile(rf"^.*{PREFIX}-{version}{SUFFIX}")
     index_url = f"{STAGING_URL}/files"
-    index_html = http.request('GET', index_url)
-    soup = BeautifulSoup(index_html.data, 'html.parser')
+    index_html = http.request("GET", index_url)
+    soup = BeautifulSoup(index_html.data, "html.parser")
     return soup.findAll(text=tmpl)
 
 
@@ -52,24 +78,24 @@ def download_wheels(version, wheelhouse):
         Directory in which to download the wheels.
 
     """
-    http = urllib3.PoolManager(cert_reqs='CERT_REQUIRED')
+    http = urllib3.PoolManager(cert_reqs="CERT_REQUIRED")
     wheel_names = get_wheel_names(version)
 
     for i, wheel_name in enumerate(wheel_names):
         wheel_url = f"{STAGING_URL}/{version}/download/{wheel_name}"
         wheel_path = os.path.join(wheelhouse, wheel_name)
-        with open(wheel_path, 'wb') as f:
-            with http.request('GET', wheel_url, preload_content=False,) as r:
+        with open(wheel_path, "wb") as f:
+            with http.request("GET", wheel_url, preload_content=False,) as r:
                 print(f"{i + 1:<4}{wheel_name}")
                 shutil.copyfileobj(r, f)
     print(f"\nTotal files downloaded: {len(wheel_names)}")
 
 
-if __name__ == '__main__':
+if __name__ == "__main__":
     parser = argparse.ArgumentParser()
     parser.add_argument(
         "version",
-         help="NumPy version to download.")
+        help="NumPy version to download.")
     parser.add_argument(
         "-w", "--wheelhouse",
         default=os.path.join(os.getcwd(), "release", "installers"),
diff --git a/tools/find_deprecated_escaped_characters.py b/tools/find_deprecated_escaped_characters.py
index 22efaae65..d7225b8e8 100644
--- a/tools/find_deprecated_escaped_characters.py
+++ b/tools/find_deprecated_escaped_characters.py
@@ -7,7 +7,7 @@ were accepted before. For instance, '\(' was previously accepted but must now
 be written as '\\(' or r'\('.
 
 """
-import sys
+
 
 def main(root):
     """Find deprecated escape sequences.
@@ -56,9 +56,6 @@ def main(root):
 if __name__ == "__main__":
     from argparse import ArgumentParser
 
-    if sys.version_info[:2] < (3, 6):
-        raise RuntimeError("Python version must be >= 3.6")
-
     parser = ArgumentParser(description="Find deprecated escaped characters")
     parser.add_argument('root', help='directory or file to be checked')
     args = parser.parse_args()
diff --git a/tools/functions_missing_types.py b/tools/functions_missing_types.py
new file mode 100755
index 000000000..99c6887a9
--- /dev/null
+++ b/tools/functions_missing_types.py
@@ -0,0 +1,134 @@
+#!/usr/bin/env python
+"""Find the functions in a module missing type annotations.
+
+To use it run
+
+./functions_missing_types.py <module>
+
+and it will print out a list of functions in the module that don't
+have types.
+
+"""
+import argparse
+import ast
+import importlib
+import os
+
+NUMPY_ROOT = os.path.dirname(os.path.join(
+    os.path.abspath(__file__), "..",
+))
+
+# Technically "public" functions (they don't start with an underscore)
+# that we don't want to include.
+EXCLUDE_LIST = {
+    "numpy": {
+        # Stdlib modules in the namespace by accident
+        "absolute_import",
+        "division",
+        "print_function",
+        "warnings",
+        "sys",
+        "os",
+        "math",
+        # Accidentally public, deprecated, or shouldn't be used
+        "Tester",
+        "add_docstring",
+        "add_newdoc",
+        "add_newdoc_ufunc",
+        "core",
+        "compat",
+        "fastCopyAndTranspose",
+        "get_array_wrap",
+        "int_asbuffer",
+        "numarray",
+        "oldnumeric",
+        "safe_eval",
+        "set_numeric_ops",
+        "test",
+        "typeDict",
+        # Builtins
+        "bool",
+        "complex",
+        "float",
+        "int",
+        "long",
+        "object",
+        "str",
+        "unicode",
+        # More standard names should be preferred
+        "alltrue",  # all
+        "sometrue",  # any
+    }
+}
+
+
+class FindAttributes(ast.NodeVisitor):
+    """Find top-level attributes/functions/classes in stubs files.
+
+    Do this by walking the stubs ast. See e.g.
+
+    https://greentreesnakes.readthedocs.io/en/latest/index.html
+
+    for more information on working with Python's ast.
+
+    """
+
+    def __init__(self):
+        self.attributes = set()
+
+    def visit_FunctionDef(self, node):
+        if node.name == "__getattr__":
+            # Not really a module member.
+            return
+        self.attributes.add(node.name)
+        # Do not call self.generic_visit; we are only interested in
+        # top-level functions.
+        return
+
+    def visit_ClassDef(self, node):
+        if not node.name.startswith("_"):
+            self.attributes.add(node.name)
+        return
+
+    def visit_AnnAssign(self, node):
+        self.attributes.add(node.target.id)
+
+
+def find_missing(module_name):
+    module_path = os.path.join(
+        NUMPY_ROOT,
+        module_name.replace(".", os.sep),
+        "__init__.pyi",
+    )
+
+    module = importlib.import_module(module_name)
+    module_attributes = {
+        attribute for attribute in dir(module) if not attribute.startswith("_")
+    }
+
+    if os.path.isfile(module_path):
+        with open(module_path) as f:
+            tree = ast.parse(f.read())
+        ast_visitor = FindAttributes()
+        ast_visitor.visit(tree)
+        stubs_attributes = ast_visitor.attributes
+    else:
+        # No stubs for this module yet.
+        stubs_attributes = set()
+
+    exclude_list = EXCLUDE_LIST.get(module_name, set())
+
+    missing = module_attributes - stubs_attributes - exclude_list
+    print("\n".join(sorted(missing)))
+
+
+def main():
+    parser = argparse.ArgumentParser()
+    parser.add_argument("module")
+    args = parser.parse_args()
+
+    find_missing(args.module)
+
+
+if __name__ == "__main__":
+    main()
diff --git a/tools/gitpod/Dockerfile b/tools/gitpod/Dockerfile
new file mode 100644
index 000000000..592a5ee0a
--- /dev/null
+++ b/tools/gitpod/Dockerfile
@@ -0,0 +1,101 @@
+#
+# Dockerfile for NumPy development
+#
+# Usage:
+# -------
+#
+# To make a local build of the container, from the 'Docker-dev' directory:
+# docker build  --rm -f "Dockerfile" -t <build-tag> "."
+#
+# To use the container use the following command. It assumes that you are in
+# the root folder of the NumPy git repository, making it available as
+# /home/numpy in the container. Whatever changes you make to that directory
+# are visible in the host and container.
+# The docker image is retrieved from the NumPy dockerhub repository
+#
+# docker run --rm -it -v $(pwd):/home/numpy numpy/numpy-dev:<image-tag>
+#
+# By default the container will activate the conda environment numpy-dev
+# which contains all the dependencies needed for NumPy development
+#
+# To build NumPy run: python setup.py build_ext --inplace
+#
+# To run the tests use: python runtests.py
+#
+# This image is based on: Ubuntu 20.04 (focal)
+# https://hub.docker.com/_/ubuntu/?tab=tags&name=focal
+# OS/ARCH: linux/amd64
+FROM gitpod/workspace-base:latest
+
+ARG MAMBAFORGE_VERSION="4.11.0-0"
+ARG CONDA_ENV=numpy-dev
+
+
+# ---- Configure environment ----
+ENV CONDA_DIR=/home/gitpod/mambaforge3 \
+    SHELL=/bin/bash
+ENV PATH=${CONDA_DIR}/bin:$PATH \
+    WORKSPACE=/workspace/numpy
+
+
+# -----------------------------------------------------------------------------
+# ---- Creating as root - note: make sure to change to gitpod in the end ----
+USER root
+
+# hadolint ignore=DL3008
+RUN apt-get update && \
+    apt-get install -yq --no-install-recommends \
+    ca-certificates \
+    dirmngr \
+    dvisvgm \
+    gnupg \
+    gpg-agent \
+    texlive-latex-extra \
+    vim && \
+    # this needs to be done after installing dirmngr
+    apt-key adv --keyserver keyserver.ubuntu.com --recv-key C99B11DEB97541F0 && \
+    apt-add-repository https://cli.github.com/packages && \
+    apt-get install -yq --no-install-recommends \
+    gh && \
+    locale-gen en_US.UTF-8 && \
+    apt-get clean && \
+    rm -rf /var/cache/apt/* &&\
+    rm -rf /var/lib/apt/lists/* &&\
+    rm -rf /tmp/*
+
+# Allows this Dockerfile to activate conda environments
+SHELL ["/bin/bash", "--login", "-o", "pipefail", "-c"]
+
+# -----------------------------------------------------------------------------
+# ---- Installing mamba  ----
+RUN wget -q -O mambaforge3.sh \
+    "https://github.com/conda-forge/miniforge/releases/download/$MAMBAFORGE_VERSION/Mambaforge-$MAMBAFORGE_VERSION-Linux-x86_64.sh" && \
+    bash mambaforge3.sh -p ${CONDA_DIR} -b && \
+    rm mambaforge3.sh
+
+# -----------------------------------------------------------------------------
+# ---- Copy needed files ----
+# basic workspace configurations
+COPY ./tools/gitpod/workspace_config /usr/local/bin/workspace_config
+
+RUN chmod a+rx /usr/local/bin/workspace_config && \
+    workspace_config
+
+# Copy conda environment file into the container - this needs to exists inside 
+# the container to create a conda environment from it
+COPY environment.yml /tmp/environment.yml
+
+# -----------------------------------------------------------------------------
+# ---- Create conda environment ----
+# Install NumPy dependencies
+RUN mamba env create -f /tmp/environment.yml && \
+    conda activate ${CONDA_ENV} && \
+    mamba install ccache -y && \
+    # needed for docs rendering later on
+    python -m pip install --no-cache-dir sphinx-autobuild && \
+    conda clean --all -f -y && \
+    rm -rf /tmp/*
+
+# -----------------------------------------------------------------------------
+# Always make sure we are not root
+USER gitpod
\ No newline at end of file
diff --git a/tools/gitpod/gitpod.Dockerfile b/tools/gitpod/gitpod.Dockerfile
new file mode 100644
index 000000000..8dac0d597
--- /dev/null
+++ b/tools/gitpod/gitpod.Dockerfile
@@ -0,0 +1,49 @@
+# Doing a local shallow clone - keeps the container secure
+# and much slimmer than using COPY directly or making a 
+# remote clone
+ARG BASE_CONTAINER="numpy/numpy-dev:latest"
+FROM gitpod/workspace-base:latest as clone
+
+COPY --chown=gitpod . /tmp/numpy_repo
+
+# the clone should be deep enough for versioneer to work
+RUN git clone --shallow-since=2021-05-22 file:////tmp/numpy_repo /tmp/numpy
+
+# -----------------------------------------------------------------------------
+# Using the numpy-dev Docker image as a base
+# This way, we ensure we have all the needed compilers and dependencies
+# while reducing the build time
+FROM ${BASE_CONTAINER} as build
+
+# -----------------------------------------------------------------------------
+USER root
+
+# -----------------------------------------------------------------------------
+# ---- ENV variables ----
+# ---- Directories needed ----
+ENV WORKSPACE=/workspace/numpy/ \
+    CONDA_ENV=numpy-dev
+
+# Allows this Dockerfile to activate conda environments
+SHELL ["/bin/bash", "--login", "-o", "pipefail", "-c"]
+
+# Copy over the shallow clone
+COPY --from=clone --chown=gitpod /tmp/numpy ${WORKSPACE}
+
+# Everything happens in the /workspace/numpy directory
+WORKDIR ${WORKSPACE}
+
+# Build numpy to populate the cache used by ccache
+RUN git config --global --add safe.directory /workspace/numpy
+RUN git submodule update --init --depth=1 -- numpy/core/src/umath/svml
+RUN conda activate ${CONDA_ENV} && \ 
+    python setup.py build_ext --inplace && \
+    ccache -s
+
+# Gitpod will load the repository into /workspace/numpy. We remove the
+# directory from the image to prevent conflicts
+RUN rm -rf ${WORKSPACE}
+
+# -----------------------------------------------------------------------------
+# Always return to non privileged user
+USER gitpod
diff --git a/tools/gitpod/settings.json b/tools/gitpod/settings.json
new file mode 100644
index 000000000..50296336d
--- /dev/null
+++ b/tools/gitpod/settings.json
@@ -0,0 +1,8 @@
+{
+    "restructuredtext.updateOnTextChanged": "true",
+    "restructuredtext.updateDelay": 300,
+    "restructuredtext.linter.disabledLinters": ["doc8","rst-lint", "rstcheck"],
+    "python.defaultInterpreterPath": "/home/gitpod/mambaforge3/envs/numpy-dev/bin/python",
+    "esbonio.sphinx.buildDir": "${workspaceRoot}/doc/build/html",
+    "esbonio.sphinx.confDir": ""
+}
\ No newline at end of file
diff --git a/tools/gitpod/workspace_config b/tools/gitpod/workspace_config
new file mode 100644
index 000000000..aa859c9be
--- /dev/null
+++ b/tools/gitpod/workspace_config
@@ -0,0 +1,58 @@
+#!/bin/bash
+# Basic configurations for the workspace
+
+set -e
+
+# gitpod/workspace-base needs at least one file here
+touch /home/gitpod/.bashrc.d/empty
+
+# Add git aliases
+git config --global alias.co checkout
+git config --global alias.ci commit
+git config --global alias.st status
+git config --global alias.br branch
+git config --global alias.hist "log --pretty=format:'%h %ad | %s%d [%an]' --graph --date=short"
+git config --global alias.type 'cat-file -t'
+git config --global alias.dump 'cat-file -p'
+
+# Enable basic vim defaults in ~/.vimrc
+echo "filetype plugin indent on" >>~/.vimrc
+echo "set colorcolumn=80" >>~/.vimrc
+echo "set number" >>~/.vimrc
+echo "syntax enable" >>~/.vimrc
+
+# Vanity custom bash prompt - makes it more legible
+echo "PS1='\[\e]0;\u \w\a\]\[\033[01;36m\]\u\[\033[m\] > \[\033[38;5;141m\]\w\[\033[m\] \\$ '" >>~/.bashrc
+
+# Enable prompt color in the skeleton .bashrc
+# hadolint ignore=SC2016
+sed -i 's/^#force_color_prompt=yes/force_color_prompt=yes/' /etc/skel/.bashrc
+
+# .gitpod.yml is configured to install NumPy from /workspace/numpy
+echo "export PYTHONPATH=${WORKSPACE}" >>~/.bashrc
+
+# make conda activate command available from /bin/bash (login and interactive)
+if [[ ! -f "/etc/profile.d/conda.sh" ]]; then
+    ln -s ${CONDA_DIR}/etc/profile.d/conda.sh /etc/profile.d/conda.sh
+fi
+echo ". ${CONDA_DIR}/etc/profile.d/conda.sh" >>~/.bashrc
+echo "conda activate numpy-dev" >>~/.bashrc
+
+# Enable prompt color in the skeleton .bashrc
+# hadolint ignore=SC2016
+sed -i 's/^#force_color_prompt=yes/force_color_prompt=yes/' /etc/skel/.bashrc
+
+# .gitpod.yml is configured to install numpy from /workspace/numpy
+echo "export PYTHONPATH=/workspace/numpy" >>~/.bashrc
+
+# Set up ccache for compilers for this Dockerfile
+# REF: https://github.com/conda-forge/compilers-feedstock/issues/31
+echo "conda activate numpy-dev" >>~/.startuprc
+echo "export CC=\"ccache \$CC\"" >>~/.startuprc
+echo "export CXX=\"ccache \$CXX\"" >>~/.startuprc
+echo "export F77=\"ccache \$F77\"" >>~/.startuprc
+echo "export F90=\"ccache \$F90\"" >>~/.startuprc
+echo "export GFORTRAN=\"ccache \$GFORTRAN\"" >>~/.startuprc
+echo "export FC=\"ccache \$FC\"" >>~/.startuprc
+echo "source ~/.startuprc" >>~/.profile
+echo "source ~/.startuprc" >>~/.bashrc
diff --git a/tools/lint_diff.ini b/tools/lint_diff.ini
new file mode 100644
index 000000000..9e31050b7
--- /dev/null
+++ b/tools/lint_diff.ini
@@ -0,0 +1,5 @@
+[pycodestyle]
+max_line_length = 79
+statistics = True
+ignore = E121,E122,E123,E125,E126,E127,E128,E226,E241,E251,E265,E266,E302,E402,E704,E712,E721,E731,E741,W291,W293,W391,W503,W504
+exclude = numpy/__config__.py,numpy/typing/tests/data
diff --git a/tools/linter.py b/tools/linter.py
new file mode 100644
index 000000000..0031ff83a
--- /dev/null
+++ b/tools/linter.py
@@ -0,0 +1,85 @@
+import os
+import sys
+import subprocess
+from argparse import ArgumentParser
+from git import Repo, exc
+
+CONFIG = os.path.join(
+         os.path.abspath(os.path.dirname(__file__)),
+         'lint_diff.ini',
+)
+
+# NOTE: The `diff` and `exclude` options of pycodestyle seem to be
+# incompatible, so instead just exclude the necessary files when
+# computing the diff itself.
+EXCLUDE = (
+    "numpy/typing/tests/data/",
+    "numpy/typing/_char_codes.py",
+    "numpy/__config__.py",
+    "numpy/f2py",
+)
+
+
+class DiffLinter:
+    def __init__(self, branch):
+        self.branch = branch
+        self.repo = Repo('.')
+        self.head = self.repo.head.commit
+
+    def get_branch_diff(self, uncommitted = False):
+        """
+            Determine the first common ancestor commit.
+            Find diff between branch and FCA commit.
+            Note: if `uncommitted` is set, check only
+                  uncommitted changes
+        """
+        try:
+            commit = self.repo.merge_base(self.branch, self.head)[0]
+        except exc.GitCommandError:
+            print(f"Branch with name `{self.branch}` does not exist")
+            sys.exit(1)
+
+        exclude = [f':(exclude){i}' for i in EXCLUDE]
+        if uncommitted:
+            diff = self.repo.git.diff(
+                self.head, '--unified=0', '***.py', *exclude
+            )
+        else:
+            diff = self.repo.git.diff(
+                commit, self.head, '--unified=0', '***.py', *exclude
+            )
+        return diff
+
+    def run_pycodestyle(self, diff):
+        """
+            Original Author: Josh Wilson (@person142)
+            Source:
+              https://github.com/scipy/scipy/blob/main/tools/lint_diff.py
+            Run pycodestyle on the given diff.
+        """
+        res = subprocess.run(
+            ['pycodestyle', '--diff', '--config', CONFIG],
+            input=diff,
+            stdout=subprocess.PIPE,
+            encoding='utf-8',
+        )
+        return res.returncode, res.stdout
+
+    def run_lint(self, uncommitted):
+        diff = self.get_branch_diff(uncommitted)
+        retcode, errors = self.run_pycodestyle(diff)
+
+        errors and print(errors)
+
+        sys.exit(retcode)
+
+
+if __name__ == '__main__':
+    parser = ArgumentParser()
+    parser.add_argument("--branch", type=str, default='main',
+                        help="The branch to diff against")
+    parser.add_argument("--uncommitted", action='store_true',
+                        help="Check only uncommitted changes")
+    args = parser.parse_args()
+
+    DiffLinter(args.branch).run_lint(args.uncommitted)
diff --git a/tools/list_installed_dll_dependencies_cygwin.sh b/tools/list_installed_dll_dependencies_cygwin.sh
new file mode 100644
index 000000000..ee06ae0d0
--- /dev/null
+++ b/tools/list_installed_dll_dependencies_cygwin.sh
@@ -0,0 +1,35 @@
+#!/bin/dash
+# Check permissions and dependencies on installed DLLs
+# DLLs need execute permissions to be used
+# DLLs must be able to find their dependencies
+# This checks both of those, then does a direct test
+# The best way of checking whether a C extension module is importable
+# is trying to import it.  The rest is trying to give reasons why it
+# isn't importing.
+#
+# One of the tools and the extension for shared libraries are
+# Cygwin-specific, but the rest should work on most platforms with
+# /bin/sh
+
+py_ver=${1}
+dll_list=`/bin/dash tools/list_numpy_dlls.sh ${py_ver}`
+echo "Checks for existence, permissions and file type"
+ls -l ${dll_list}
+file ${dll_list}
+echo "Dependency checks"
+ldd ${dll_list} | grep -F -e " => not found" && exit 1
+cygcheck ${dll_list} >cygcheck_dll_list 2>cygcheck_missing_deps
+grep -F -e "cygcheck: track_down: could not find " cygcheck_missing_deps && exit 1
+echo "Import tests"
+mkdir -p dist/
+cd dist/
+for name in ${dll_list};
+do
+    echo ${name}
+    ext_module=`echo ${name} | \
+                     sed -E \
+			 -e "s/^\/+(home|usr).*?site-packages\/+//" \
+			 -e "s/.cpython-3.m?-x86(_64)?-cygwin.dll$//" \
+			 -e "s/\//./g"`
+    python${py_ver} -c "import ${ext_module}"
+done
diff --git a/tools/list_numpy_dlls.sh b/tools/list_numpy_dlls.sh
new file mode 100644
index 000000000..fedd2097b
--- /dev/null
+++ b/tools/list_numpy_dlls.sh
@@ -0,0 +1,9 @@
+#!/bin/dash
+# Print the list of dlls installed by NumPy
+
+py_ver=${1}
+site_packages=`python${py_ver} -m pip show numpy | \
+		    grep Location | cut -d " " -f 2 -`;
+dll_list=`for name in $(python${py_ver} -m pip show -f numpy | \
+			     grep -F .dll); do echo ${site_packages}/${name}; done`
+echo ${dll_list}
diff --git a/tools/npy_tempita/__init__.py b/tools/npy_tempita/__init__.py
index 50a995104..fedcd91f4 100644
--- a/tools/npy_tempita/__init__.py
+++ b/tools/npy_tempita/__init__.py
@@ -705,7 +705,7 @@ lead_whitespace_re = re.compile(r'^[\t ]*\n')
 
 def trim_lex(tokens):
     r"""
-    Takes a lexed set of tokens, and removes whitespace when there is
+    Takes a lexed list of tokens, and removes whitespace when there is
     a directive on a line by itself:
 
        >>> tokens = lex('{{if x}}\nx\n{{endif}}\ny', trim_whitespace=False)
diff --git a/tools/openblas_support.py b/tools/openblas_support.py
index cbb6a5e43..ce677f9a5 100644
--- a/tools/openblas_support.py
+++ b/tools/openblas_support.py
@@ -2,6 +2,7 @@ import glob
 import hashlib
 import os
 import platform
+import sysconfig
 import sys
 import shutil
 import tarfile
@@ -10,52 +11,39 @@ import zipfile
 
 from tempfile import mkstemp, gettempdir
 from urllib.request import urlopen, Request
+from urllib.error import HTTPError
 
-OPENBLAS_V = '0.3.9'
-# Temporary build of OpenBLAS to test a fix for dynamic detection of CPU
-OPENBLAS_LONG = 'v0.3.7-527-g79fd006c'  # the 0.3.7 is misleading
+OPENBLAS_V = '0.3.20'
+OPENBLAS_LONG = 'v0.3.20'
 BASE_LOC = 'https://anaconda.org/multibuild-wheels-staging/openblas-libs'
 BASEURL = f'{BASE_LOC}/{OPENBLAS_LONG}/download'
-ARCHITECTURES = ['', 'windows', 'darwin', 'aarch64', 'x86_64', 'i686', 'ppc64le', 's390x']
-sha256_vals = {
-"openblas-v0.3.7-527-g79fd006c-win_amd64-gcc_7_1_0.zip": "7249d68c02e6b6339e06edfeab1fecddf29ee1e67a3afaa77917c320c43de840",
-"openblas64_-v0.3.7-527-g79fd006c-win_amd64-gcc_7_1_0.zip": "6488e0961a5926e47242f63b63b41cfdd661e6f1d267e8e313e397cde4775c17",
-"openblas-v0.3.7-527-g79fd006c-win32-gcc_7_1_0.zip": "5fb0867ca70b1d0fdbf68dd387c0211f26903d74631420e4aabb49e94aa3930d",
-"openblas-v0.3.7-527-g79fd006c-macosx_10_9_x86_64-gf_1becaaa.tar.gz": "69434bd626bbc495da9ce8c36b005d140c75e3c47f94e88c764a199e820f9259",
-"openblas64_-v0.3.7-527-g79fd006c-macosx_10_9_x86_64-gf_1becaaa.tar.gz": "093f6d953e3fa76a86809be67bd1f0b27656671b5a55b233169cfaa43fd63e22",
-"openblas-v0.3.7-527-g79fd006c-manylinux2014_aarch64.tar.gz": "42676c69dc48cd6e412251b39da6b955a5a0e00323ddd77f9137f7c259d35319",
-"openblas64_-v0.3.7-527-g79fd006c-manylinux2014_aarch64.tar.gz": "5aec167af4052cf5e9e3e416c522d9794efabf03a2aea78b9bb3adc94f0b73d8",
-"openblas-v0.3.7-527-g79fd006c-manylinux2010_x86_64.tar.gz": "fa67c6cc29d4cc5c70a147c80526243239a6f95fc3feadcf83a78176cd9c526b",
-"openblas64_-v0.3.7-527-g79fd006c-manylinux2010_x86_64.tar.gz": "9ad34e89a5307dcf5823bf5c020580d0559a0c155fe85b44fc219752e61852b0",
-"openblas-v0.3.7-527-g79fd006c-manylinux2010_i686.tar.gz": "0b8595d316c8b7be84ab1f1d5a0c89c1b35f7c987cdaf61d441bcba7ab4c7439",
-"openblas-v0.3.7-527-g79fd006c-manylinux2014_ppc64le.tar.gz": "3e1c7d6472c34e7210e3605be4bac9ddd32f613d44297dc50cf2d067e720c4a9",
-"openblas64_-v0.3.7-527-g79fd006c-manylinux2014_ppc64le.tar.gz": "a0885873298e21297a04be6cb7355a585df4fa4873e436b4c16c0a18fc9073ea",
-"openblas-v0.3.7-527-g79fd006c-manylinux2014_s390x.tar.gz": "79b454320817574e20499d58f05259ed35213bea0158953992b910607b17f240",
-"openblas64_-v0.3.7-527-g79fd006c-manylinux2014_s390x.tar.gz": "9fddbebf5301518fc4a5d2022a61886544a0566868c8c014359a1ee6b17f2814",
-"openblas-v0.3.7-527-g79fd006c-manylinux1_i686.tar.gz": "24fb92684ec4676185fff5c9340f50c3db6075948bcef760e9c715a8974e4680",
-"openblas-v0.3.7-527-g79fd006c-manylinux1_x86_64.tar.gz": "ebb8236b57a1b4075fd5cdc3e9246d2900c133a42482e5e714d1e67af5d00e62",
-"openblas-v0.3.7-527-g79fd006c-manylinux1_i686.tar.gz": "24fb92684ec4676185fff5c9340f50c3db6075948bcef760e9c715a8974e4680",
-"openblas-v0.3.7-527-g79fd006c-manylinux1_x86_64.tar.gz": "ebb8236b57a1b4075fd5cdc3e9246d2900c133a42482e5e714d1e67af5d00e62",
-"openblas-v0.3.7-527-g79fd006c-manylinux1_i686.tar.gz": "24fb92684ec4676185fff5c9340f50c3db6075948bcef760e9c715a8974e4680",
-"openblas-v0.3.7-527-g79fd006c-manylinux1_x86_64.tar.gz": "ebb8236b57a1b4075fd5cdc3e9246d2900c133a42482e5e714d1e67af5d00e62",
-}
+SUPPORTED_PLATFORMS = [
+    'linux-aarch64',
+    'linux-x86_64',
+    'linux-i686',
+    'linux-ppc64le',
+    'linux-s390x',
+    'win-amd64',
+    'win-32',
+    'macosx-x86_64',
+    'macosx-arm64',
+]
+IS_32BIT = sys.maxsize < 2**32
 
 
-IS_32BIT = sys.maxsize < 2**32
+def get_plat():
+    plat = sysconfig.get_platform()
+    plat_split = plat.split("-")
+    arch = plat_split[-1]
+    if arch == "win32":
+        plat = "win-32"
+    elif arch in ["universal2", "intel"]:
+        plat = f"macosx-{platform.uname().machine}"
+    elif len(plat_split) > 2:
+        plat = f"{plat_split[0]}-{arch}"
+    assert plat in SUPPORTED_PLATFORMS,  f'invalid platform {plat}'
+    return plat
 
-def get_arch():
-    if platform.system() == 'Windows':
-        ret = 'windows'
-    elif platform.system() == 'Darwin':
-        ret = 'darwin'
-    else:
-        ret = platform.uname().machine
-        # What do 32 bit machines report?
-        # If they are a docker, they can report x86_64
-        if 'x86' in ret and IS_32BIT:
-            arch = 'i686'
-    assert ret in ARCHITECTURES, f'invalid architecture {ret}'
-    return ret
 
 def get_ilp64():
     if os.environ.get("NPY_USE_BLAS_ILP64", "0") == "0":
@@ -64,6 +52,7 @@ def get_ilp64():
         raise RuntimeError("NPY_USE_BLAS_ILP64 set on 32-bit arch")
     return "64_"
 
+
 def get_manylinux(arch):
     if arch in ('x86_64', 'i686'):
         default = '2010'
@@ -71,36 +60,44 @@ def get_manylinux(arch):
         default = '2014'
     ret = os.environ.get("MB_ML_VER", default)
     # XXX For PEP 600 this can be a glibc version
-    assert ret in ('1', '2010', '2014'), f'invalid MB_ML_VER {ret}'
+    assert ret in ('1', '2010', '2014', '_2_24'), f'invalid MB_ML_VER {ret}'
     return ret
 
 
-def download_openblas(target, arch, ilp64):
-    ml_ver = get_manylinux(arch)
+def download_openblas(target, plat, ilp64):
+    osname, arch = plat.split("-")
     fnsuffix = {None: "", "64_": "64_"}[ilp64]
     filename = ''
-    headers = {'User-Agent': ('Mozilla/5.0 (Windows NT 6.1) AppleWebKit/537.36 ; '
-                              '(KHTML, like Gecko) Chrome/41.0.2228.0 '
-                              'Safari/537.3')}
-    if arch in ('aarch64', 'ppc64le', 's390x', 'x86_64', 'i686'):
+    headers = {'User-Agent':
+               ('Mozilla/5.0 (Windows NT 6.1) AppleWebKit/537.36 ; '
+                '(KHTML, like Gecko) Chrome/41.0.2228.0 Safari/537.3')}
+    suffix = None
+    if osname == "linux":
+        ml_ver = get_manylinux(arch)
         suffix = f'manylinux{ml_ver}_{arch}.tar.gz'
-        filename = f'{BASEURL}/openblas{fnsuffix}-{OPENBLAS_LONG}-{suffix}'
         typ = 'tar.gz'
-    elif arch == 'darwin':
+    elif plat == 'macosx-x86_64':
         suffix = 'macosx_10_9_x86_64-gf_1becaaa.tar.gz'
-        filename = f'{BASEURL}/openblas{fnsuffix}-{OPENBLAS_LONG}-{suffix}'
         typ = 'tar.gz'
-    elif arch == 'windows':
-        if IS_32BIT:
-            suffix = 'win32-gcc_7_1_0.zip'
+    elif plat == 'macosx-arm64':
+        suffix = 'macosx_11_0_arm64-gf_f26990f.tar.gz'
+        typ = 'tar.gz'
+    elif osname == 'win':
+        if plat == "win-32":
+            suffix = 'win32-gcc_8_1_0.zip'
         else:
-            suffix = 'win_amd64-gcc_7_1_0.zip'
-        filename = f'{BASEURL}/openblas{fnsuffix}-{OPENBLAS_LONG}-{suffix}'
+            suffix = 'win_amd64-gcc_8_1_0.zip'
         typ = 'zip'
-    if not filename:
+
+    if not suffix:
         return None
+    filename = f'{BASEURL}/openblas{fnsuffix}-{OPENBLAS_LONG}-{suffix}'
     req = Request(url=filename, headers=headers)
-    response = urlopen(req)
+    try:
+        response = urlopen(req)
+    except HTTPError:
+        print(f'Could not download "{filename}"', file=sys.stderr)
+        raise
     length = response.getheader('content-length')
     if response.status != 200:
         print(f'Could not download "{filename}"', file=sys.stderr)
@@ -109,19 +106,13 @@ def download_openblas(target, arch, ilp64):
     data = response.read()
     # Verify hash
     key = os.path.basename(filename)
-    sha256_returned = hashlib.sha256(data).hexdigest()
-    if key not in sha256_vals:
-        raise ValueError(
-            f'key "{key}" with hash "{sha256_returned}" not in sha256_vals')
-    sha256_expected = sha256_vals[key]
-    if sha256_returned != sha256_expected:
-        raise ValueError(f'sha256 hash mismatch for filename {filename}')
     print("Saving to file", file=sys.stderr)
     with open(target, 'wb') as fid:
         fid.write(data)
     return typ
 
-def setup_openblas(arch=get_arch(), ilp64=get_ilp64()):
+
+def setup_openblas(plat=get_plat(), ilp64=get_ilp64()):
     '''
     Download and setup an openblas library for building. If successful,
     the configuration script will find it automatically.
@@ -133,34 +124,40 @@ def setup_openblas(arch=get_arch(), ilp64=get_ilp64()):
         To determine success, do ``os.path.exists(msg)``
     '''
     _, tmp = mkstemp()
-    if not arch:
-        raise ValueError('unknown architecture')
-    typ = download_openblas(tmp, arch, ilp64)
+    if not plat:
+        raise ValueError('unknown platform')
+    typ = download_openblas(tmp, plat, ilp64)
     if not typ:
         return ''
-    if arch == 'windows':
+    osname, arch = plat.split("-")
+    if osname == 'win':
         if not typ == 'zip':
-            return 'expecting to download zipfile on windows, not %s' % str(typ)
+            return f'expecting to download zipfile on windows, not {typ}'
         return unpack_windows_zip(tmp)
     else:
         if not typ == 'tar.gz':
             return 'expecting to download tar.gz, not %s' % str(typ)
         return unpack_targz(tmp)
 
+
 def unpack_windows_zip(fname):
     with zipfile.ZipFile(fname, 'r') as zf:
         # Get the openblas.a file, but not openblas.dll.a nor openblas.dev.a
         lib = [x for x in zf.namelist() if OPENBLAS_LONG in x and
-                  x.endswith('a') and not x.endswith('dll.a') and
-                  not x.endswith('dev.a')]
+               x.endswith('a') and not x.endswith('dll.a') and
+               not x.endswith('dev.a')]
         if not lib:
             return 'could not find libopenblas_%s*.a ' \
                     'in downloaded zipfile' % OPENBLAS_LONG
-        target = os.path.join(gettempdir(), 'openblas.a')
+        if get_ilp64() is None:
+            target = os.path.join(gettempdir(), 'openblas.a')
+        else:
+            target = os.path.join(gettempdir(), 'openblas64_.a')
         with open(target, 'wb') as fid:
             fid.write(zf.read(lib[0]))
     return target
 
+
 def unpack_targz(fname):
     target = os.path.join(gettempdir(), 'openblas')
     if not os.path.exists(target):
@@ -171,6 +168,7 @@ def unpack_targz(fname):
         extract_tarfile_to(zf, target, prefix)
         return target
 
+
 def extract_tarfile_to(tarfileobj, target_path, archive_path):
     """Extract TarFile contents under archive_path/ to target_path/"""
 
@@ -194,6 +192,7 @@ def extract_tarfile_to(tarfileobj, target_path, archive_path):
 
     tarfileobj.extractall(target_path, members=get_members())
 
+
 def make_init(dirname):
     '''
     Create a _distributor_init.py file for OpenBlas
@@ -228,39 +227,54 @@ def make_init(dirname):
                             DLL_filenames.append(filename)
                     if len(DLL_filenames) > 1:
                         import warnings
-                        warnings.warn("loaded more than 1 DLL from .libs:\\n%s" %
-                                      "\\n".join(DLL_filenames),
+                        warnings.warn("loaded more than 1 DLL from .libs:"
+                                      "\\n%s" % "\\n".join(DLL_filenames),
                                       stacklevel=1)
     """))
 
-def test_setup(arches):
+
+def test_setup(plats):
     '''
     Make sure all the downloadable files exist and can be opened
     '''
     def items():
-        for arch in arches:
-            yield arch, None
-            if arch not in ('i686'):
-                yield arch, '64_'
+        """ yields all combinations of arch, ilp64
+        """
+        for plat in plats:
+            yield plat, None
+            osname, arch = plat.split("-")
+            if arch not in ('i686', 'arm64', '32'):
+                yield plat, '64_'
+            if osname == "linux" and arch in ('i686', 'x86_64'):
+                oldval = os.environ.get('MB_ML_VER', None)
+                os.environ['MB_ML_VER'] = '1'
+                yield plat, None
+                # Once we create x86_64 and i686 manylinux2014 wheels...
+                # os.environ['MB_ML_VER'] = '2014'
+                # yield arch, None, False
+                if oldval:
+                    os.environ['MB_ML_VER'] = oldval
+                else:
+                    os.environ.pop('MB_ML_VER')
 
     errs = []
-    for arch, ilp64 in items():
-        if arch == '':
+    for plat, ilp64 in items():
+        osname, _ = plat.split("-")
+        if plat not in plats:
             continue
-
         target = None
         try:
             try:
-                target = setup_openblas(arch, ilp64)
+                target = setup_openblas(plat, ilp64)
             except Exception as e:
-                print(f'Could not setup {arch}:')
-                print(str(e))
+                print(f'Could not setup {plat} with ilp64 {ilp64}, ')
+                print(e)
                 errs.append(e)
                 continue
             if not target:
-                raise RuntimeError(f'Could not setup {arch}')
+                raise RuntimeError(f'Could not setup {plat}')
             print(target)
-            if arch == 'windows':
+            if osname == 'win':
                 if not target.endswith('.a'):
                     raise RuntimeError("Not .a extracted!")
             else:
@@ -290,28 +304,31 @@ def test_version(expected_version, ilp64=get_ilp64()):
         get_config = dll.openblas_get_config64_
     else:
         get_config = dll.openblas_get_config
-    get_config.restype=ctypes.c_char_p
+    get_config.restype = ctypes.c_char_p
     res = get_config()
     print('OpenBLAS get_config returned', str(res))
     if not expected_version:
         expected_version = OPENBLAS_V
     check_str = b'OpenBLAS %s' % expected_version.encode()
     print(check_str)
-    assert check_str in res, '%s not found in %s' %(expected_version, res)
+    assert check_str in res, f'{expected_version} not found in {res}'
     if ilp64:
         assert b"USE64BITINT" in res
     else:
         assert b"USE64BITINT" not in res
 
+
 if __name__ == '__main__':
     import argparse
     parser = argparse.ArgumentParser(
-        description='Download and expand an OpenBLAS archive for this ' \
+        description='Download and expand an OpenBLAS archive for this '
                     'architecture')
     parser.add_argument('--test', nargs='*', default=None,
-        help='Test different architectures. "all", or any of %s' % ARCHITECTURES)
+                        help='Test different architectures. "all", or any of '
+                             f'{SUPPORTED_PLATFORMS}')
     parser.add_argument('--check_version', nargs='?', default='',
-        help='Check provided OpenBLAS version string against available OpenBLAS')
+                        help='Check provided OpenBLAS version string '
+                             'against available OpenBLAS')
     args = parser.parse_args()
     if args.check_version != '':
         test_version(args.check_version)
@@ -319,6 +336,6 @@ if __name__ == '__main__':
         print(setup_openblas())
     else:
         if len(args.test) == 0 or 'all' in args.test:
-            test_setup(ARCHITECTURES)
+            test_setup(SUPPORTED_PLATFORMS)
         else:
             test_setup(args.test)
diff --git a/tools/pypy-test.sh b/tools/pypy-test.sh
deleted file mode 100755
index e24d7a99d..000000000
--- a/tools/pypy-test.sh
+++ /dev/null
@@ -1,49 +0,0 @@
-#!/usr/bin/env bash
-
-# Exit if a command fails
-set -e
-set -o pipefail
-# Print expanded commands
-set -x
-
-sudo apt-get -yq update
-sudo apt-get -yq install gfortran-5
-export F77=gfortran-5
-export F90=gfortran-5
-
-# Download the proper OpenBLAS x64 precompiled library
-target=$(python3 tools/openblas_support.py)
-ls -lR "$target"
-echo getting OpenBLAS into $target
-export LD_LIBRARY_PATH=$target/lib
-export LIB=$target/lib
-export INCLUDE=$target/include
-
-# Use a site.cfg to build with local openblas
-cat << EOF > site.cfg
-[openblas]
-libraries = openblas
-library_dirs = $target/lib:$LIB
-include_dirs = $target/lib:$LIB
-runtime_library_dirs = $target/lib
-EOF
-
-echo getting PyPy 3.6-v7.3.1
-wget -q https://downloads.python.org/pypy/pypy3.6-v7.3.1-linux64.tar.bz2 -O pypy.tar.bz2
-mkdir -p pypy3
-(cd pypy3; tar --strip-components=1 -xf ../pypy.tar.bz2)
-pypy3/bin/pypy3 -mensurepip
-pypy3/bin/pypy3 -m pip install --upgrade pip setuptools wheel
-pypy3/bin/pypy3 -m pip install --user -r test_requirements.txt --no-warn-script-location
-
-echo
-echo pypy3 version
-pypy3/bin/pypy3 -c "import sys; print(sys.version)"
-echo
-
-pypy3/bin/pypy3 runtests.py --debug-info --show-build-log -v -- -rsx \
-      --junitxml=junit/test-results.xml --durations 10
-
-echo Make sure the correct openblas has been linked in
-pypy3/bin/pypy3 -mpip install --no-build-isolation .
-pypy3/bin/pypy3 tools/openblas_support.py --check_version
diff --git a/tools/rebase_installed_dlls_cygwin.sh b/tools/rebase_installed_dlls_cygwin.sh
new file mode 100644
index 000000000..f772879d9
--- /dev/null
+++ b/tools/rebase_installed_dlls_cygwin.sh
@@ -0,0 +1,5 @@
+#!/bin/dash
+# Rebase the dlls installed by NumPy
+
+py_ver=${1}
+/usr/bin/rebase --database --oblivious `/bin/dash tools/list_numpy_dlls.sh ${py_ver}`
diff --git a/tools/refguide_check.py b/tools/refguide_check.py
index b3891c5cb..47a77ab6d 100644
--- a/tools/refguide_check.py
+++ b/tools/refguide_check.py
@@ -19,11 +19,12 @@ another function, or deprecated, or ...)
 Another use of this helper script is to check validity of code samples
 in docstrings::
 
-    $ python refguide_check.py --doctests ma
+    $ python tools/refguide_check.py --doctests ma
 
 or in RST-based documentations::
 
-    $ python refguide_check.py --rst docs
+    $ python tools/refguide_check.py --rst doc/source
+
 """
 import copy
 import doctest
@@ -71,7 +72,6 @@ BASE_MODULE = "numpy"
 
 PUBLIC_SUBMODULES = [
     'core',
-    'doc.structured_arrays',
     'f2py',
     'linalg',
     'lib',
@@ -93,18 +93,29 @@ OTHER_MODULE_DOCS = {
 
 # these names are known to fail doctesting and we like to keep it that way
 # e.g. sometimes pseudocode is acceptable etc
-DOCTEST_SKIPLIST = set([
+#
+# Optionally, a subset of methods can be skipped by setting dict-values
+# to a container of method-names
+DOCTEST_SKIPDICT = {
     # cases where NumPy docstrings import things from SciPy:
-    'numpy.lib.vectorize',
-    'numpy.random.standard_gamma',
-    'numpy.random.gamma',
-    'numpy.random.vonmises',
-    'numpy.random.power',
-    'numpy.random.zipf',
+    'numpy.lib.vectorize': None,
+    'numpy.random.standard_gamma': None,
+    'numpy.random.gamma': None,
+    'numpy.random.vonmises': None,
+    'numpy.random.power': None,
+    'numpy.random.zipf': None,
+    # cases where NumPy docstrings import things from other 3'rd party libs:
+    'numpy.core.from_dlpack': None,
     # remote / local file IO with DataSource is problematic in doctest:
-    'numpy.lib.DataSource',
-    'numpy.lib.Repository',
-])
+    'numpy.lib.DataSource': None,
+    'numpy.lib.Repository': None,
+}
+if sys.version_info < (3, 9):
+    DOCTEST_SKIPDICT.update({
+        "numpy.core.ndarray": {"__class_getitem__"},
+        "numpy.core.dtype": {"__class_getitem__"},
+        "numpy.core.number": {"__class_getitem__"},
+    })
 
 # Skip non-numpy RST files, historical release notes
 # Any single-directory exact match will skip the directory and all subdirs.
@@ -118,10 +129,18 @@ RST_SKIPLIST = [
     'changelog',
     'doc/release',
     'doc/source/release',
+    'doc/release/upcoming_changes',
     'c-info.ufunc-tutorial.rst',
     'c-info.python-as-glue.rst',
     'f2py.getting-started.rst',
+    'f2py-examples.rst',
     'arrays.nditer.cython.rst',
+    # See PR 17222, these should be fixed
+    'basics.dispatch.rst',
+    'basics.subclassing.rst',
+    'basics.interoperability.rst',
+    'misc.rst',
+    'TESTS.rst'
 ]
 
 # these names are not required to be present in ALL despite being in
@@ -157,9 +176,8 @@ def short_path(path, cwd=None):
 
     Parameters
     ----------
-    path: str or None
-
-    cwd: str or None
+    path : str or None
+    cwd : str or None
 
     Returns
     -------
@@ -260,7 +278,7 @@ def get_all_dict(module):
         except ValueError:
             pass
     if not all_dict:
-        # Must be a pure documentation module like doc.structured_arrays
+        # Must be a pure documentation module
         all_dict.append('__doc__')
 
     # Modules are almost always private; real submodules need a separate
@@ -296,7 +314,7 @@ def compare(all_dict, others, names, module_name):
         List of non deprecated sub modules for module_name
     others : list
         List of sub modules for module_name
-    names :  set
+    names : set
         Set of function names or special directives present in
         docstring of module_name
     module_name : ModuleType
@@ -335,8 +353,8 @@ def is_deprecated(f):
     """
     Check if module `f` is deprecated
 
-    Parameter
-    ---------
+    Parameters
+    ----------
     f : ModuleType
 
     Returns
@@ -388,8 +406,8 @@ def check_items(all_dict, names, deprecated, others, module_name, dots=True):
     output += "Objects in refguide: %i\n\n" % num_ref
 
     only_all, only_ref, missing = compare(all_dict, others, names, module_name)
-    dep_in_ref = set(only_ref).intersection(deprecated)
-    only_ref = set(only_ref).difference(deprecated)
+    dep_in_ref = only_ref.intersection(deprecated)
+    only_ref = only_ref.difference(deprecated)
 
     if len(dep_in_ref) > 0:
         output += "Deprecated objects in refguide::\n\n"
@@ -771,13 +789,12 @@ def _run_doctests(tests, full_name, verbose, doctest_warnings):
 
     Parameters
     ----------
-    tests: list
+    tests : list
 
     full_name : str
 
     verbose : bool
-
-    doctest_warning : bool
+    doctest_warnings : bool
 
     Returns
     -------
@@ -863,8 +880,12 @@ def check_doctests(module, verbose, ns=None,
     for name in get_all_dict(module)[0]:
         full_name = module.__name__ + '.' + name
 
-        if full_name in DOCTEST_SKIPLIST:
-            continue
+        if full_name in DOCTEST_SKIPDICT:
+            skip_methods = DOCTEST_SKIPDICT[full_name]
+            if skip_methods is None:
+                continue
+        else:
+            skip_methods = None
 
         try:
             obj = getattr(module, name)
@@ -885,6 +906,10 @@ def check_doctests(module, verbose, ns=None,
                             traceback.format_exc()))
             continue
 
+        if skip_methods is not None:
+            tests = [i for i in tests if
+                     i.name.partition(".")[2] not in skip_methods]
+
         success, output = _run_doctests(tests, full_name, verbose,
                                         doctest_warnings)
 
@@ -965,7 +990,7 @@ def check_doctests_testfile(fname, verbose, ns=None,
     results = []
 
     _, short_name = os.path.split(fname)
-    if short_name in DOCTEST_SKIPLIST:
+    if short_name in DOCTEST_SKIPDICT:
         return results
 
     full_name = fname
@@ -1144,7 +1169,12 @@ def main(argv):
         init_matplotlib()
 
     for submodule_name in module_names:
-        module_name = BASE_MODULE + '.' + submodule_name
+        prefix = BASE_MODULE + '.'
+        if not submodule_name.startswith(prefix):
+            module_name = prefix + submodule_name
+        else:
+            module_name = submodule_name
+            
         __import__(module_name)
         module = sys.modules[module_name]
 
diff --git a/tools/swig/README b/tools/swig/README
index 7fa0599c6..c539c597f 100644
--- a/tools/swig/README
+++ b/tools/swig/README
@@ -15,7 +15,7 @@ system used here, can be found in the NumPy reference guide.
 Testing
 -------
 The tests are a good example of what we are trying to do with numpy.i.
-The files related to testing are are in the test subdirectory::
+The files related to testing are in the test subdirectory::
 
     Vector.h
     Vector.cxx
diff --git a/tools/swig/numpy.i b/tools/swig/numpy.i
index 8416e82f3..0ef92bab1 100644
--- a/tools/swig/numpy.i
+++ b/tools/swig/numpy.i
@@ -114,8 +114,8 @@
     if (py_obj == NULL          ) return "C NULL value";
     if (py_obj == Py_None       ) return "Python None" ;
     if (PyCallable_Check(py_obj)) return "callable"    ;
-    if (PyString_Check(  py_obj)) return "string"      ;
-    if (PyInt_Check(     py_obj)) return "int"         ;
+    if (PyBytes_Check(   py_obj)) return "string"      ;
+    if (PyLong_Check(    py_obj)) return "int"         ;
     if (PyFloat_Check(   py_obj)) return "float"       ;
     if (PyDict_Check(    py_obj)) return "dict"        ;
     if (PyList_Check(    py_obj)) return "list"        ;
@@ -524,7 +524,7 @@
     return success;
   }
 
-  /* Require the given PyArrayObject to to be Fortran ordered.  If the
+  /* Require the given PyArrayObject to be Fortran ordered.  If the
    * the PyArrayObject is already Fortran ordered, do nothing.  Else,
    * set the Fortran ordering flag and recompute the strides.
    */
@@ -2002,7 +2002,7 @@
   (PyObject* array = NULL)
 {
   npy_intp dims[1];
-  if (!PyInt_Check($input))
+  if (!PyLong_Check($input))
   {
     const char* typestring = pytype_string($input);
     PyErr_Format(PyExc_TypeError,
@@ -2010,7 +2010,8 @@
                  typestring);
     SWIG_fail;
   }
-  $2 = (DIM_TYPE) PyInt_AsLong($input);
+  $2 = (DIM_TYPE) PyLong_AsSsize_t($input);
+  if ($2 == -1 && PyErr_Occurred()) SWIG_fail;
   dims[0] = (npy_intp) $2;
   array = PyArray_SimpleNew(1, dims, DATA_TYPECODE);
   if (!array) SWIG_fail;
@@ -2030,7 +2031,7 @@
   (PyObject* array = NULL)
 {
   npy_intp dims[1];
-  if (!PyInt_Check($input))
+  if (!PyLong_Check($input))
   {
     const char* typestring = pytype_string($input);
     PyErr_Format(PyExc_TypeError,
@@ -2038,7 +2039,8 @@
                  typestring);
     SWIG_fail;
   }
-  $1 = (DIM_TYPE) PyInt_AsLong($input);
+  $1 = (DIM_TYPE) PyLong_AsSsize_t($input);
+  if ($1 == -1 && PyErr_Occurred()) SWIG_fail;
   dims[0] = (npy_intp) $1;
   array = PyArray_SimpleNew(1, dims, DATA_TYPECODE);
   if (!array) SWIG_fail;
@@ -2492,9 +2494,9 @@
   if (!array) SWIG_fail;
 
 %#ifdef SWIGPY_USE_CAPSULE
-    PyObject* cap = PyCapsule_New((void*)(*$1), SWIGPY_CAPSULE_NAME, free_cap);
+    PyObject* cap = PyCapsule_New((void*)(*$2), SWIGPY_CAPSULE_NAME, free_cap);
 %#else
-    PyObject* cap = PyCObject_FromVoidPtr((void*)(*$1), free);
+    PyObject* cap = PyCObject_FromVoidPtr((void*)(*$2), free);
 %#endif
 
 %#if NPY_API_VERSION < 0x00000007
@@ -2562,9 +2564,9 @@
   if (!array) SWIG_fail;
 
 %#ifdef SWIGPY_USE_CAPSULE
-    PyObject* cap = PyCapsule_New((void*)(*$1), SWIGPY_CAPSULE_NAME, free_cap);
+    PyObject* cap = PyCapsule_New((void*)(*$3), SWIGPY_CAPSULE_NAME, free_cap);
 %#else
-    PyObject* cap = PyCObject_FromVoidPtr((void*)(*$1), free);
+    PyObject* cap = PyCObject_FromVoidPtr((void*)(*$3), free);
 %#endif
 
 %#if NPY_API_VERSION < 0x00000007
@@ -2632,9 +2634,9 @@
   if (!array || !require_fortran(array)) SWIG_fail;
 
 %#ifdef SWIGPY_USE_CAPSULE
-    PyObject* cap = PyCapsule_New((void*)(*$1), SWIGPY_CAPSULE_NAME, free_cap);
+    PyObject* cap = PyCapsule_New((void*)(*$3), SWIGPY_CAPSULE_NAME, free_cap);
 %#else
-    PyObject* cap = PyCObject_FromVoidPtr((void*)(*$1), free);
+    PyObject* cap = PyCObject_FromVoidPtr((void*)(*$3), free);
 %#endif
 
 %#if NPY_API_VERSION < 0x00000007
@@ -2706,9 +2708,9 @@
   if (!array) SWIG_fail;
 
 %#ifdef SWIGPY_USE_CAPSULE
-    PyObject* cap = PyCapsule_New((void*)(*$1), SWIGPY_CAPSULE_NAME, free_cap);
+    PyObject* cap = PyCapsule_New((void*)(*$4), SWIGPY_CAPSULE_NAME, free_cap);
 %#else
-    PyObject* cap = PyCObject_FromVoidPtr((void*)(*$1), free);
+    PyObject* cap = PyCObject_FromVoidPtr((void*)(*$4), free);
 %#endif
 
 %#if NPY_API_VERSION < 0x00000007
@@ -2780,9 +2782,9 @@
   if (!array || !require_fortran(array)) SWIG_fail;
 
 %#ifdef SWIGPY_USE_CAPSULE
-    PyObject* cap = PyCapsule_New((void*)(*$1), SWIGPY_CAPSULE_NAME, free_cap);
+    PyObject* cap = PyCapsule_New((void*)(*$4), SWIGPY_CAPSULE_NAME, free_cap);
 %#else
-    PyObject* cap = PyCObject_FromVoidPtr((void*)(*$1), free);
+    PyObject* cap = PyCObject_FromVoidPtr((void*)(*$4), free);
 %#endif
 
 %#if NPY_API_VERSION < 0x00000007
@@ -2856,161 +2858,9 @@
   if (!array) SWIG_fail;
 
 %#ifdef SWIGPY_USE_CAPSULE
-    PyObject* cap = PyCapsule_New((void*)(*$1), SWIGPY_CAPSULE_NAME, free_cap);
+    PyObject* cap = PyCapsule_New((void*)(*$5), SWIGPY_CAPSULE_NAME, free_cap);
 %#else
-    PyObject* cap = PyCObject_FromVoidPtr((void*)(*$1), free);
-%#endif
-
-%#if NPY_API_VERSION < 0x00000007
-  PyArray_BASE(array) = cap;
-%#else
-  PyArray_SetBaseObject(array,cap);
-%#endif
-
-  $result = SWIG_Python_AppendOutput($result,obj);
-}
-
-/* Typemap suite for (DATA_TYPE** ARGOUTVIEWM_FARRAY4, DIM_TYPE* DIM1, DIM_TYPE* DIM2,
-                      DIM_TYPE* DIM3, DIM_TYPE* DIM4)
- */
-%typemap(in,numinputs=0)
-  (DATA_TYPE** ARGOUTVIEWM_FARRAY4, DIM_TYPE* DIM1    , DIM_TYPE* DIM2    , DIM_TYPE* DIM3    , DIM_TYPE* DIM4    )
-  (DATA_TYPE* data_temp = NULL    , DIM_TYPE dim1_temp, DIM_TYPE dim2_temp, DIM_TYPE dim3_temp, DIM_TYPE dim4_temp)
-{
-  $1 = &data_temp;
-  $2 = &dim1_temp;
-  $3 = &dim2_temp;
-  $4 = &dim3_temp;
-  $5 = &dim4_temp;
-}
-%typemap(argout,
-         fragment="NumPy_Backward_Compatibility,NumPy_Array_Requirements,NumPy_Utilities")
-  (DATA_TYPE** ARGOUTVIEWM_FARRAY4, DIM_TYPE* DIM1, DIM_TYPE* DIM2, DIM_TYPE* DIM3)
-{
-  npy_intp dims[4] = { *$2, *$3, *$4 , *$5 };
-  PyObject* obj = PyArray_SimpleNewFromData(4, dims, DATA_TYPECODE, (void*)(*$1));
-  PyArrayObject* array = (PyArrayObject*) obj;
-
-  if (!array || !require_fortran(array)) SWIG_fail;
-
-%#ifdef SWIGPY_USE_CAPSULE
-    PyObject* cap = PyCapsule_New((void*)(*$1), SWIGPY_CAPSULE_NAME, free_cap);
-%#else
-    PyObject* cap = PyCObject_FromVoidPtr((void*)(*$1), free);
-%#endif
-
-%#if NPY_API_VERSION < 0x00000007
-  PyArray_BASE(array) = cap;
-%#else
-  PyArray_SetBaseObject(array,cap);
-%#endif
-
-  $result = SWIG_Python_AppendOutput($result,obj);
-}
-
-/* Typemap suite for (DIM_TYPE* DIM1, DIM_TYPE* DIM2, DIM_TYPE* DIM3, DIM_TYPE* DIM4,
-                      DATA_TYPE** ARGOUTVIEWM_FARRAY4)
- */
-%typemap(in,numinputs=0)
-  (DIM_TYPE* DIM1    , DIM_TYPE* DIM2    , DIM_TYPE* DIM3    , DIM_TYPE* DIM4    , DATA_TYPE** ARGOUTVIEWM_FARRAY4)
-  (DIM_TYPE dim1_temp, DIM_TYPE dim2_temp, DIM_TYPE dim3_temp, DIM_TYPE dim4_temp, DATA_TYPE* data_temp = NULL    )
-{
-  $1 = &dim1_temp;
-  $2 = &dim2_temp;
-  $3 = &dim3_temp;
-  $4 = &dim4_temp;
-  $5 = &data_temp;
-}
-%typemap(argout,
-         fragment="NumPy_Backward_Compatibility,NumPy_Array_Requirements,NumPy_Utilities")
-  (DIM_TYPE* DIM1, DIM_TYPE* DIM2, DIM_TYPE* DIM3, DIM_TYPE* DIM4, DATA_TYPE** ARGOUTVIEWM_FARRAY4)
-{
-  npy_intp dims[4] = { *$1, *$2, *$3 , *$4 };
-  PyObject* obj = PyArray_SimpleNewFromData(4, dims, DATA_TYPECODE, (void*)(*$5));
-  PyArrayObject* array = (PyArrayObject*) obj;
-
-  if (!array || !require_fortran(array)) SWIG_fail;
-
-%#ifdef SWIGPY_USE_CAPSULE
-    PyObject* cap = PyCapsule_New((void*)(*$1), SWIGPY_CAPSULE_NAME, free_cap);
-%#else
-    PyObject* cap = PyCObject_FromVoidPtr((void*)(*$1), free);
-%#endif
-
-%#if NPY_API_VERSION < 0x00000007
-  PyArray_BASE(array) = cap;
-%#else
-  PyArray_SetBaseObject(array,cap);
-%#endif
-
-  $result = SWIG_Python_AppendOutput($result,obj);
-}
-
-/* Typemap suite for (DATA_TYPE** ARGOUTVIEWM_ARRAY4, DIM_TYPE* DIM1, DIM_TYPE* DIM2,
-                      DIM_TYPE* DIM3, DIM_TYPE* DIM4)
- */
-%typemap(in,numinputs=0)
-  (DATA_TYPE** ARGOUTVIEWM_ARRAY4, DIM_TYPE* DIM1    , DIM_TYPE* DIM2    , DIM_TYPE* DIM3    , DIM_TYPE* DIM4    )
-  (DATA_TYPE* data_temp = NULL   , DIM_TYPE dim1_temp, DIM_TYPE dim2_temp, DIM_TYPE dim3_temp, DIM_TYPE dim4_temp)
-{
-  $1 = &data_temp;
-  $2 = &dim1_temp;
-  $3 = &dim2_temp;
-  $4 = &dim3_temp;
-  $5 = &dim4_temp;
-}
-%typemap(argout,
-         fragment="NumPy_Backward_Compatibility,NumPy_Utilities")
-  (DATA_TYPE** ARGOUTVIEWM_ARRAY4, DIM_TYPE* DIM1, DIM_TYPE* DIM2, DIM_TYPE* DIM3, DIM_TYPE* DIM4)
-{
-  npy_intp dims[4] = { *$2, *$3, *$4 , *$5 };
-  PyObject* obj = PyArray_SimpleNewFromData(4, dims, DATA_TYPECODE, (void*)(*$1));
-  PyArrayObject* array = (PyArrayObject*) obj;
-
-  if (!array) SWIG_fail;
-
-%#ifdef SWIGPY_USE_CAPSULE
-    PyObject* cap = PyCapsule_New((void*)(*$1), SWIGPY_CAPSULE_NAME, free_cap);
-%#else
-    PyObject* cap = PyCObject_FromVoidPtr((void*)(*$1), free);
-%#endif
-
-%#if NPY_API_VERSION < 0x00000007
-  PyArray_BASE(array) = cap;
-%#else
-  PyArray_SetBaseObject(array,cap);
-%#endif
-
-  $result = SWIG_Python_AppendOutput($result,obj);
-}
-
-/* Typemap suite for (DIM_TYPE* DIM1, DIM_TYPE* DIM2, DIM_TYPE* DIM3, DIM_TYPE* DIM4,
-                      DATA_TYPE** ARGOUTVIEWM_ARRAY4)
- */
-%typemap(in,numinputs=0)
-  (DIM_TYPE* DIM1    , DIM_TYPE* DIM2    , DIM_TYPE* DIM3    , DIM_TYPE* DIM4    , DATA_TYPE** ARGOUTVIEWM_ARRAY4)
-  (DIM_TYPE dim1_temp, DIM_TYPE dim2_temp, DIM_TYPE dim3_temp, DIM_TYPE dim4_temp, DATA_TYPE* data_temp = NULL   )
-{
-  $1 = &dim1_temp;
-  $2 = &dim2_temp;
-  $3 = &dim3_temp;
-  $4 = &dim4_temp;
-  $5 = &data_temp;
-}
-%typemap(argout,
-         fragment="NumPy_Backward_Compatibility,NumPy_Utilities")
-  (DIM_TYPE* DIM1, DIM_TYPE* DIM2, DIM_TYPE* DIM3, DIM_TYPE* DIM4, DATA_TYPE** ARGOUTVIEWM_ARRAY4)
-{
-  npy_intp dims[4] = { *$1, *$2, *$3 , *$4 };
-  PyObject* obj = PyArray_SimpleNewFromData(4, dims, DATA_TYPECODE, (void*)(*$5));
-  PyArrayObject* array = (PyArrayObject*) obj;
-
-  if (!array) SWIG_fail;
-
-%#ifdef SWIGPY_USE_CAPSULE
-    PyObject* cap = PyCapsule_New((void*)(*$1), SWIGPY_CAPSULE_NAME, free_cap);
-%#else
-    PyObject* cap = PyCObject_FromVoidPtr((void*)(*$1), free);
+    PyObject* cap = PyCObject_FromVoidPtr((void*)(*$5), free);
 %#endif
 
 %#if NPY_API_VERSION < 0x00000007
@@ -3084,9 +2934,9 @@
   if (!array || !require_fortran(array)) SWIG_fail;
 
 %#ifdef SWIGPY_USE_CAPSULE
-    PyObject* cap = PyCapsule_New((void*)(*$1), SWIGPY_CAPSULE_NAME, free_cap);
+    PyObject* cap = PyCapsule_New((void*)(*$5), SWIGPY_CAPSULE_NAME, free_cap);
 %#else
-    PyObject* cap = PyCObject_FromVoidPtr((void*)(*$1), free);
+    PyObject* cap = PyCObject_FromVoidPtr((void*)(*$5), free);
 %#endif
 
 %#if NPY_API_VERSION < 0x00000007
diff --git a/tools/swig/pyfragments.swg b/tools/swig/pyfragments.swg
index c3ca8f125..6d3e6ff41 100644
--- a/tools/swig/pyfragments.swg
+++ b/tools/swig/pyfragments.swg
@@ -22,12 +22,9 @@
   SWIGINTERN int
   SWIG_AsVal_dec(long)(PyObject * obj, long * val)
   {
-    if (PyInt_Check(obj)) {
-      if (val) *val = PyInt_AsLong(obj);
-      return SWIG_OK;
-    } else if (PyLong_Check(obj)) {
+    if (PyLong_Check(obj)) {
       long v = PyLong_AsLong(obj);
-      if (!PyErr_Occurred()) {
+      if (v != -1 || !PyErr_Occurred()) {
 	if (val) *val = v;
 	return SWIG_OK;
       } else {
@@ -37,8 +34,8 @@
 %#ifdef SWIG_PYTHON_CAST_MODE
     {
       int dispatch = 0;
-      long v = PyInt_AsLong(obj);
-      if (!PyErr_Occurred()) {
+      long v = PyLong_AsLong(obj);
+      if (v != -1 || !PyErr_Occurred()) {
 	if (val) *val = v;
 	return SWIG_AddCast(SWIG_OK);
       } else {
@@ -56,7 +53,7 @@
 %#endif
     if (!PyArray_IsScalar(obj,Integer)) return SWIG_TypeError;
     if (!val) return SWIG_OK;
-    PyArray_Descr * longDescr = PyArray_DescrNewFromType(NPY_LONG);
+    PyArray_Descr * longDescr = PyArray_DescrFromType(NPY_LONG);
     PyArray_CastScalarToCtype(obj, (void*)val, longDescr);
     Py_DECREF(longDescr);
     return SWIG_OK;
@@ -107,7 +104,7 @@
 %#endif
     if (!PyArray_IsScalar(obj,Integer)) return SWIG_TypeError;
     if (!val) return SWIG_OK;
-    PyArray_Descr * ulongDescr = PyArray_DescrNewFromType(NPY_ULONG);
+    PyArray_Descr * ulongDescr = PyArray_DescrFromType(NPY_ULONG);
     PyArray_CastScalarToCtype(obj, (void*)val, ulongDescr);
     Py_DECREF(ulongDescr);
     return SWIG_OK;
diff --git a/tools/swig/test/testFarray.py b/tools/swig/test/testFarray.py
index 43a6003f4..29bf96fe2 100755
--- a/tools/swig/test/testFarray.py
+++ b/tools/swig/test/testFarray.py
@@ -28,7 +28,7 @@ class FarrayTestCase(unittest.TestCase):
 
     def testConstructor1(self):
         "Test Farray size constructor"
-        self.failUnless(isinstance(self.array, Farray.Farray))
+        self.assertTrue(isinstance(self.array, Farray.Farray))
 
     def testConstructor2(self):
         "Test Farray copy constructor"
@@ -36,7 +36,7 @@ class FarrayTestCase(unittest.TestCase):
             for j in range(self.ncols):
                 self.array[i, j] = i + j
         arrayCopy = Farray.Farray(self.array)
-        self.failUnless(arrayCopy == self.array)
+        self.assertTrue(arrayCopy == self.array)
 
     def testConstructorBad1(self):
         "Test Farray size constructor, negative nrows"
@@ -48,15 +48,15 @@ class FarrayTestCase(unittest.TestCase):
 
     def testNrows(self):
         "Test Farray nrows method"
-        self.failUnless(self.array.nrows() == self.nrows)
+        self.assertTrue(self.array.nrows() == self.nrows)
 
     def testNcols(self):
         "Test Farray ncols method"
-        self.failUnless(self.array.ncols() == self.ncols)
+        self.assertTrue(self.array.ncols() == self.ncols)
 
     def testLen(self):
         "Test Farray __len__ method"
-        self.failUnless(len(self.array) == self.nrows*self.ncols)
+        self.assertTrue(len(self.array) == self.nrows*self.ncols)
 
     def testSetGet(self):
         "Test Farray __setitem__, __getitem__ methods"
@@ -67,7 +67,7 @@ class FarrayTestCase(unittest.TestCase):
                 self.array[i, j] = i*j
         for i in range(m):
             for j in range(n):
-                self.failUnless(self.array[i, j] == i*j)
+                self.assertTrue(self.array[i, j] == i*j)
 
     def testSetBad1(self):
         "Test Farray __setitem__ method, negative row"
@@ -113,7 +113,7 @@ class FarrayTestCase(unittest.TestCase):
         for i in range(self.nrows):
             for j in range(self.ncols):
                 self.array[i, j] = i+j
-        self.failUnless(self.array.asString() == result)
+        self.assertTrue(self.array.asString() == result)
 
     def testStr(self):
         "Test Farray __str__ method"
@@ -127,7 +127,7 @@ class FarrayTestCase(unittest.TestCase):
         for i in range(self.nrows):
             for j in range(self.ncols):
                 self.array[i, j] = i-j
-        self.failUnless(str(self.array) == result)
+        self.assertTrue(str(self.array) == result)
 
     def testView(self):
         "Test Farray view method"
@@ -135,11 +135,11 @@ class FarrayTestCase(unittest.TestCase):
             for j in range(self.ncols):
                 self.array[i, j] = i+j
         a = self.array.view()
-        self.failUnless(isinstance(a, np.ndarray))
-        self.failUnless(a.flags.f_contiguous)
+        self.assertTrue(isinstance(a, np.ndarray))
+        self.assertTrue(a.flags.f_contiguous)
         for i in range(self.nrows):
             for j in range(self.ncols):
-                self.failUnless(a[i, j] == i+j)
+                self.assertTrue(a[i, j] == i+j)
 
 ######################################################################
 
diff --git a/tools/travis-before-install.sh b/tools/travis-before-install.sh
index e468dd932..056e97472 100755
--- a/tools/travis-before-install.sh
+++ b/tools/travis-before-install.sh
@@ -9,18 +9,25 @@ free -m
 df -h
 ulimit -a
 
+sudo apt update
+sudo apt install gfortran eatmydata libgfortran5
+
+if [ "$USE_DEBUG" ]
+then
+    sudo apt install python3-dbg python3-dev python3-setuptools
+fi
+
 mkdir builds
 pushd builds
 
 # Build into own virtualenv
 # We therefore control our own environment, avoid travis' numpy
-pip install -U virtualenv
 
 if [ -n "$USE_DEBUG" ]
 then
-  virtualenv --python=$(which python3-dbg) venv
+  python3-dbg -m venv venv
 else
-  virtualenv --python=python venv
+  python -m venv venv
 fi
 
 source venv/bin/activate
@@ -29,7 +36,7 @@ gcc --version
 
 popd
 
-pip install --upgrade pip
+pip install --upgrade pip 'setuptools<49.2.0' wheel
 
 # 'setuptools', 'wheel' and 'cython' are build dependencies.  This information
 # is stored in pyproject.toml, but there is not yet a standard way to install
@@ -41,7 +48,7 @@ pip install --upgrade pip
 # A specific version of cython is required, so we read the cython package
 # requirement using `grep cython test_requirements.txt` instead of simply
 # writing 'pip install setuptools wheel cython'.
-pip install setuptools wheel `grep cython test_requirements.txt`
+pip install `grep cython test_requirements.txt`
 
 if [ -n "$DOWNLOAD_OPENBLAS" ]; then
   pwd
diff --git a/tools/travis-sorter.py b/tools/travis-sorter.py
new file mode 100755
index 000000000..416f9fe76
--- /dev/null
+++ b/tools/travis-sorter.py
@@ -0,0 +1,287 @@
+#!/usr/bin/env python3
+"""
+Run with a repo/build number or list of Travis CI build times to show the optimal build
+order to run faster and make full use of all available parallel build jobs.
+
+Requires the Travis Client CLI
+
+https://github.com/travis-ci/travis.rb#installation
+
+# Example
+
+$ # Check build 22 of hugovk/numpy, and skip the first job (it's a single stage)
+$ travis-sorter.py hugovk/numpy 22 --skip 1
+travis show -r hugovk/numpy 22
+[8, 7, 8, 10, 9, 18, 8, 11, 8, 10, 8, 8, 17, 8, 26]
+[7, 8, 10, 9, 18, 8, 11, 8, 10, 8, 8, 17, 8, 26]
+Before:
+
+ID Duration in mins
+ 1 *******
+ 2 ********
+ 3 **********
+ 4 *********
+ 5 ******************
+ 6        ********
+ 7         ***********
+ 8          ********
+ 9           **********
+10                ********
+11                  ********
+12                   *****************
+13                    ********
+14                     **************************
+End: 46
+   ----------------------------------------------
+
+After:
+
+ID Duration in mins
+14 **************************
+ 5 ******************
+12 *****************
+ 7 ***********
+ 3 **********
+ 9           **********
+ 4            *********
+ 2                  ********
+ 6                   ********
+ 8                     ********
+10                     ********
+11                          ********
+13                           ********
+ 1                           *******
+End: 34
+   ----------------------------------
+
+# Example
+
+$ python travis-sorter.py 4 4 4 4 4 12 19
+
+Before:
+
+****
+****
+****
+****
+****
+    ************
+    *******************
+12345678901234567890123 = 23 minutes
+
+After:
+
+*******************
+************
+****
+****
+****
+    ****
+    ****
+1234567890123456789 = 19 minutes
+"""
+import argparse
+import re
+import subprocess
+import sys
+
+count = 1
+
+
+def summarise(jobs):
+    end = 0
+    print("ID Duration in mins")
+    for job in jobs:
+        before = " " * job.started
+        active = "*" * job.length
+        print("{:2d} {}{}".format(job.id, before, active))
+        if job.started + job.length > end:
+            end = job.started + job.length
+    # for job in jobs:
+    #     print(job)
+    print("End:", end)
+    print("   " + "-" * end)
+
+
+class Job:
+    def __init__(self, length):
+        global count
+        self.id = count
+        count += 1
+        self.length = length
+        self.started = -1
+        self.status = "not started"
+        self.ended = False
+
+    def __str__(self):
+        return "{}\tLength: {}\tStarted: {}\tEnded: {}".format(
+            self.id, self.length, self.started, self.ended
+        )
+
+
+def count_status(jobs, status):
+    number = 0
+    for job in jobs:
+        if job.status == status:
+            number += 1
+    return number
+
+
+def simulate(jobs, limit):
+
+    time = 0
+
+    # summarise(jobs)
+
+    while True:
+        # Check if any have ended
+        for job in jobs:
+            if job.status == "active":
+                if time >= job.started + job.length:
+                    # print("{}/{} Finished:".format(count_status(jobs, "active"), limit))
+                    job.ended = time
+                    job.status = "finished"
+                    # print(job)
+
+        # Check if any can start
+        for job in jobs:
+            if job.status == "not started":
+                if count_status(jobs, "active") < limit:
+                    # print("{}/{} Starting:".format(count_status(jobs, "active"), limit))
+                    job.started = time
+                    job.status = "active"
+                    # print(job)
+
+        time += 1
+
+        # Exit loop?
+        if count_status(jobs, "finished") == len(jobs):
+            break
+
+    summarise(jobs)
+
+
+def do_thing(repo, number):
+    cmd = f"travis show -r {repo} {number or ''}"
+    # cmd = f"travis show --com -r {repo} {number or ''}"
+    print(cmd)
+
+    exitcode = 0
+    # For offline testing
+    output = """Build #4:  Upgrade Python syntax with pyupgrade https://github.com/asottile/pyupgrade
+State:         passed
+Type:          push
+Branch:        add-3.7
+Compare URL:   https://github.com/hugovk/diff-cover/compare/4ae7cf97c6fa...7eeddb300175
+Duration:      16 min 7 sec
+Started:       2018-10-17 19:03:01
+Finished:      2018-10-17 19:09:53
+
+#4.1 passed:     1 min          os: linux, env: TOXENV=py27, python: 2.7
+#4.2 passed:     1 min 43 sec   os: linux, env: TOXENV=py34, python: 3.4
+#4.3 passed:     1 min 52 sec   os: linux, env: TOXENV=py35, python: 3.5
+#4.4 passed:     1 min 38 sec   os: linux, env: TOXENV=py36, python: 3.6
+#4.5 passed:     1 min 47 sec   os: linux, env: TOXENV=py37, python: 3.7
+#4.6 passed:     4 min 35 sec   os: linux, env: TOXENV=pypy, python: pypy
+#4.7 passed:     3 min 17 sec   os: linux, env: TOXENV=pypy3, python: pypy3"""
+
+    # For offline testing
+    output = """Build #9:  :arrows_clockwise: [EngCom] Public Pull Requests - 2.3-develop
+State:         errored
+Type:          push
+Branch:        2.3-develop
+Compare URL:   https://github.com/hugovk/magento2/compare/80469a61e061...77af5d65ef4f
+Duration:      4 hrs 12 min 13 sec
+Started:       2018-10-27 17:50:51
+Finished:      2018-10-27 18:54:14
+
+#9.1 passed:     3 min 30 sec   os: linux, env: TEST_SUITE=unit, php: 7.1
+#9.2 passed:     3 min 35 sec   os: linux, env: TEST_SUITE=unit, php: 7.2
+#9.3 passed:     3 min 41 sec   os: linux, env: TEST_SUITE=static, php: 7.2
+#9.4 passed:     8 min 48 sec   os: linux, env: TEST_SUITE=js GRUNT_COMMAND=spec, php: 7.2
+#9.5 passed:     3 min 24 sec   os: linux, env: TEST_SUITE=js GRUNT_COMMAND=static, php: 7.2
+#9.6 errored:    50 min         os: linux, env: TEST_SUITE=integration INTEGRATION_INDEX=1, php: 7.1
+#9.7 passed:     49 min 25 sec  os: linux, env: TEST_SUITE=integration INTEGRATION_INDEX=1, php: 7.2
+#9.8 passed:     31 min 54 sec  os: linux, env: TEST_SUITE=integration INTEGRATION_INDEX=2, php: 7.1
+#9.9 passed:     31 min 24 sec  os: linux, env: TEST_SUITE=integration INTEGRATION_INDEX=2, php: 7.2
+#9.10 passed:    27 min 23 sec  os: linux, env: TEST_SUITE=integration INTEGRATION_INDEX=3, php: 7.1
+#9.11 passed:    26 min 9 sec   os: linux, env: TEST_SUITE=integration INTEGRATION_INDEX=3, php: 7.2
+#9.12 passed:    13 min         os: linux, env: TEST_SUITE=functional, php: 7.2"""
+
+    # Real use
+    exitcode, output = subprocess.getstatusoutput(cmd)
+
+    # print(exitcode)
+    # print(output)
+    if exitcode != 0:
+        print(output)
+        sys.exit(exitcode)
+
+    minutes = []
+    matches = re.findall(r"(pass|fail|error)ed.* (\d+) min (\d+)? ", output)
+    for match in matches:
+        status, m, s = match
+        s = 0 if s == "" else int(s)
+        s += int(m) * 60
+        minutes.append(round(s / 60))
+
+    # print(minutes)
+    return minutes
+
+
+if __name__ == "__main__":
+    parser = argparse.ArgumentParser(
+        description="Either give minutes for --jobs (3 5 3 2 5), "
+        "or --repo slug (hugovk/test) and build --number (5)",
+        formatter_class=argparse.ArgumentDefaultsHelpFormatter,
+    )
+    parser.add_argument(
+        "input",
+        nargs="+",
+        help="Either: times for each build job (minutes), "
+        "or an org/repo slug and optionally build number",
+    )
+    parser.add_argument(
+        "-l", "--limit", type=int, default=5, help="Concurrent jobs limit"
+    )
+    parser.add_argument(
+        "-s", "--skip", type=int, default=0, help="Skip X jobs at the start"
+    )
+    args = parser.parse_args()
+
+    # If all ints
+    try:
+        for x in args.input:
+            int(x)
+        job_times = args.input
+    except ValueError:
+        try:
+            number = args.input[1]
+        except IndexError:
+            number = None
+        job_times = do_thing(args.input[0], number)
+
+    job_times = job_times[args.skip :]
+    # print(job_times)
+
+    print("Before:")
+    print()
+
+    jobs = []
+    for job_time in job_times:
+        job = Job(job_time)
+        jobs.append(job)
+
+    simulate(jobs, args.limit)
+
+    print()
+    print("After:")
+    print()
+
+    # Sort with longest first
+    jobs.sort(key=lambda job: job.length, reverse=True)
+    # Reset status
+    for job in jobs:
+        job.status = "not started"
+
+    simulate(jobs, args.limit)
diff --git a/tools/travis-test.sh b/tools/travis-test.sh
index 225cbfa0c..db5b3f744 100755
--- a/tools/travis-test.sh
+++ b/tools/travis-test.sh
@@ -36,21 +36,33 @@ setup_base()
   sysflags="$($PYTHON -c "from distutils import sysconfig; \
     print (sysconfig.get_config_var('CFLAGS'))")"
   export CFLAGS="$sysflags $werrors -Wlogical-op -Wno-sign-compare"
+  # SIMD extensions that need to be tested on both runtime and compile-time via (test_simd.py)
+  # any specified features will be ignored if they're not supported by compiler or platform
+  # note: it almost the same default value of --simd-test execpt adding policy `$werror` to treat all
+  # warnings as errors
+  simd_test="\$werror BASELINE SSE2 SSE42 XOP FMA4 (FMA3 AVX2) AVX512F AVX512_SKX VSX VSX2 VSX3 NEON ASIMD"
   # We used to use 'setup.py install' here, but that has the terrible
   # behaviour that if a copy of the package is already installed in the
   # install location, then the new copy just gets dropped on top of it.
   # Travis typically has a stable numpy release pre-installed, and if we
   # don't remove it, then we can accidentally end up e.g. running old
   # test modules that were in the stable release but have been removed
-  # from master. (See gh-2765, gh-2768.)  Using 'pip install' also has
+  # from main. (See gh-2765, gh-2768.)  Using 'pip install' also has
   # the advantage that it tests that numpy is 'pip install' compatible,
   # see e.g. gh-2766...
   if [ -z "$USE_DEBUG" ]; then
-    $PIP install -v . 2>&1 | tee log
+    # activates '-Werror=undef' when DEBUG isn't enabled since _cffi_backend'
+    # extension breaks the build due to the following error:
+    #
+    # error: "HAVE_FFI_PREP_CIF_VAR" is not defined, evaluates to 0 [-Werror=undef]
+    # #if !HAVE_FFI_PREP_CIF_VAR && defined(__arm64__) && defined(__APPLE__)
+    #
+    export CFLAGS="$CFLAGS -Werror=undef"
+    $PYTHON setup.py build --simd-test "$simd_test" install 2>&1 | tee log
   else
     # The job run with USE_DEBUG=1 on travis needs this.
     export CFLAGS=$CFLAGS" -Wno-maybe-uninitialized"
-    $PYTHON setup.py build build_src --verbose-cfg build_ext --inplace 2>&1 | tee log
+    $PYTHON setup.py build --simd-test "$simd_test" build_src --verbose-cfg build_ext --inplace 2>&1 | tee log
   fi
   grep -v "_configtest" log \
     | grep -vE "ld returned 1|no files found matching" \
@@ -71,17 +83,12 @@ run_test()
   # in test_requirements.txt) does not provide a wheel, and the source tar
   # file does not install correctly when Python's optimization level is set
   # to strip docstrings (see https://github.com/eliben/pycparser/issues/291).
-  PYTHONOPTIMIZE="" $PIP install -r test_requirements.txt
+  PYTHONOPTIMIZE="" $PIP install -r test_requirements.txt pyinstaller
+  DURATIONS_FLAG="--durations 10"
 
   if [ -n "$USE_DEBUG" ]; then
     export PYTHONPATH=$PWD
-  fi
-
-  # pytest aborts when running --durations with python3.6-dbg, so only enable
-  # it for non-debug tests. That is a cPython bug fixed in later versions of
-  # python3.7 but python3.7-dbg is not currently available on travisCI.
-  if [ -z "$USE_DEBUG" ]; then
-    DURATIONS_FLAG="--durations 10"
+    export MYPYPATH=$PWD
   fi
 
   if [ -n "$RUN_COVERAGE" ]; then
@@ -104,7 +111,7 @@ run_test()
     export PYTHONWARNINGS="ignore::DeprecationWarning:virtualenv"
     $PYTHON -b ../runtests.py -n -v --mode=full $DURATIONS_FLAG $COVERAGE_FLAG
   else
-    $PYTHON ../runtests.py -n -v $DURATIONS_FLAG
+    $PYTHON ../runtests.py -n -v $DURATIONS_FLAG -- -rs
   fi
 
   if [ -n "$RUN_COVERAGE" ]; then
@@ -158,7 +165,7 @@ if [ -n "$USE_WHEEL" ] && [ $# -eq 0 ]; then
   fi
   $PYTHON setup.py build --warn-error build_src --verbose-cfg bdist_wheel
   # Make another virtualenv to install into
-  virtualenv --python=`which $PYTHON` venv-for-wheel
+  $PYTHON -m venv venv-for-wheel
   . venv-for-wheel/bin/activate
   # Move out of source directory to avoid finding local numpy
   pushd dist
@@ -174,7 +181,7 @@ elif [ -n "$USE_SDIST" ] && [ $# -eq 0 ]; then
   export CFLAGS=$CFLAGS" -Wno-sign-compare -Wno-unused-result"
   $PYTHON setup.py sdist
   # Make another virtualenv to install into
-  virtualenv --python=`which $PYTHON` venv-for-wheel
+  $PYTHON -m venv venv-for-wheel
   . venv-for-wheel/bin/activate
   # Move out of source directory to avoid finding local numpy
   pushd dist
diff --git a/tools/wheels/LICENSE_linux.txt b/tools/wheels/LICENSE_linux.txt
new file mode 100644
index 000000000..9ea808afc
--- /dev/null
+++ b/tools/wheels/LICENSE_linux.txt
@@ -0,0 +1,880 @@
+
+----
+
+This binary distribution of NumPy also bundles the following software:
+
+
+Name: OpenBLAS
+Files: .libs/libopenb*.so
+Description: bundled as a dynamically linked library
+Availability: https://github.com/xianyi/OpenBLAS/
+License: 3-clause BSD
+  Copyright (c) 2011-2014, The OpenBLAS Project
+  All rights reserved.
+
+  Redistribution and use in source and binary forms, with or without
+  modification, are permitted provided that the following conditions are
+  met:
+
+     1. Redistributions of source code must retain the above copyright
+        notice, this list of conditions and the following disclaimer.
+
+     2. Redistributions in binary form must reproduce the above copyright
+        notice, this list of conditions and the following disclaimer in
+        the documentation and/or other materials provided with the
+        distribution.
+     3. Neither the name of the OpenBLAS project nor the names of
+        its contributors may be used to endorse or promote products
+        derived from this software without specific prior written
+        permission.
+
+  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+  AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+  IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+  ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+  LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+  DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+  SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+  CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+  OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
+  USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+
+Name: LAPACK
+Files: .libs/libopenb*.so
+Description: bundled in OpenBLAS
+Availability: https://github.com/xianyi/OpenBLAS/
+License 3-clause BSD
+  Copyright (c) 1992-2013 The University of Tennessee and The University
+                          of Tennessee Research Foundation.  All rights
+                          reserved.
+  Copyright (c) 2000-2013 The University of California Berkeley. All
+                          rights reserved.
+  Copyright (c) 2006-2013 The University of Colorado Denver.  All rights
+                          reserved.
+
+  $COPYRIGHT$
+
+  Additional copyrights may follow
+
+  $HEADER$
+
+  Redistribution and use in source and binary forms, with or without
+  modification, are permitted provided that the following conditions are
+  met:
+
+  - Redistributions of source code must retain the above copyright
+    notice, this list of conditions and the following disclaimer.
+
+  - Redistributions in binary form must reproduce the above copyright
+    notice, this list of conditions and the following disclaimer listed
+    in this license in the documentation and/or other materials
+    provided with the distribution.
+
+  - Neither the name of the copyright holders nor the names of its
+    contributors may be used to endorse or promote products derived from
+    this software without specific prior written permission.
+
+  The copyright holders provide no reassurances that the source code
+  provided does not infringe any patent, copyright, or any other
+  intellectual property rights of third parties.  The copyright holders
+  disclaim any liability to any recipient for claims brought against
+  recipient by any third party for infringement of that parties
+  intellectual property rights.
+
+  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+  "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+  LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+  A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+  OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+  SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+  LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+  DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+  THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+  OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+
+Name: GCC runtime library
+Files: .libs/libgfortran*.so
+Description: dynamically linked to files compiled with gcc
+Availability: https://gcc.gnu.org/viewcvs/gcc/
+License: GPLv3 + runtime exception
+  Copyright (C) 2002-2017 Free Software Foundation, Inc.
+
+  Libgfortran is free software; you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation; either version 3, or (at your option)
+  any later version.
+
+  Libgfortran is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+
+  Under Section 7 of GPL version 3, you are granted additional
+  permissions described in the GCC Runtime Library Exception, version
+  3.1, as published by the Free Software Foundation.
+
+  You should have received a copy of the GNU General Public License and
+  a copy of the GCC Runtime Library Exception along with this program;
+  see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
+  <http://www.gnu.org/licenses/>.
+
+----
+
+Full text of license texts referred to above follows (that they are
+listed below does not necessarily imply the conditions apply to the
+present binary release):
+
+----
+
+GCC RUNTIME LIBRARY EXCEPTION
+
+Version 3.1, 31 March 2009
+
+Copyright (C) 2009 Free Software Foundation, Inc. <http://fsf.org/>
+
+Everyone is permitted to copy and distribute verbatim copies of this
+license document, but changing it is not allowed.
+
+This GCC Runtime Library Exception ("Exception") is an additional
+permission under section 7 of the GNU General Public License, version
+3 ("GPLv3"). It applies to a given file (the "Runtime Library") that
+bears a notice placed by the copyright holder of the file stating that
+the file is governed by GPLv3 along with this Exception.
+
+When you use GCC to compile a program, GCC may combine portions of
+certain GCC header files and runtime libraries with the compiled
+program. The purpose of this Exception is to allow compilation of
+non-GPL (including proprietary) programs to use, in this way, the
+header files and runtime libraries covered by this Exception.
+
+0. Definitions.
+
+A file is an "Independent Module" if it either requires the Runtime
+Library for execution after a Compilation Process, or makes use of an
+interface provided by the Runtime Library, but is not otherwise based
+on the Runtime Library.
+
+"GCC" means a version of the GNU Compiler Collection, with or without
+modifications, governed by version 3 (or a specified later version) of
+the GNU General Public License (GPL) with the option of using any
+subsequent versions published by the FSF.
+
+"GPL-compatible Software" is software whose conditions of propagation,
+modification and use would permit combination with GCC in accord with
+the license of GCC.
+
+"Target Code" refers to output from any compiler for a real or virtual
+target processor architecture, in executable form or suitable for
+input to an assembler, loader, linker and/or execution
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+use of source code generators and preprocessors need not be considered
+part of the Compilation Process, since the Compilation Process can be
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+
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+work based on GCC. For example, using non-GPL-compatible Software to
+optimize any GCC intermediate representations would not qualify as an
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+
+1. Grant of Additional Permission.
+
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+may then convey such a combination under terms of your choice,
+consistent with the licensing of the Independent Modules.
+
+2. No Weakening of GCC Copyleft.
+
+The availability of this Exception does not imply any general
+presumption that third-party software is unaffected by the copyleft
+requirements of the license of GCC.
+
+----
+
+                    GNU GENERAL PUBLIC LICENSE
+                       Version 3, 29 June 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <http://fsf.org/>
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
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diff --git a/tools/wheels/LICENSE_osx.txt b/tools/wheels/LICENSE_osx.txt
new file mode 100644
index 000000000..9a687c3b6
--- /dev/null
+++ b/tools/wheels/LICENSE_osx.txt
@@ -0,0 +1,789 @@
+
+----
+
+This binary distribution of NumPy also bundles the following software:
+
+
+Name: GCC runtime library
+Files: .dylibs/*
+Description: dynamically linked to files compiled with gcc
+Availability: https://gcc.gnu.org/viewcvs/gcc/
+License: GPLv3 + runtime exception
+  Copyright (C) 2002-2017 Free Software Foundation, Inc.
+
+  Libgfortran is free software; you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation; either version 3, or (at your option)
+  any later version.
+
+  Libgfortran is distributed in the hope that it will be useful,
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+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+
+  Under Section 7 of GPL version 3, you are granted additional
+  permissions described in the GCC Runtime Library Exception, version
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+  <http://www.gnu.org/licenses/>.
+
+----
+
+Full text of license texts referred to above follows (that they are
+listed below does not necessarily imply the conditions apply to the
+present binary release):
+
+----
+
+GCC RUNTIME LIBRARY EXCEPTION
+
+Version 3.1, 31 March 2009
+
+Copyright (C) 2009 Free Software Foundation, Inc. <http://fsf.org/>
+
+Everyone is permitted to copy and distribute verbatim copies of this
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+----
+
+                    GNU GENERAL PUBLIC LICENSE
+                       Version 3, 29 June 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <http://fsf.org/>
+ Everyone is permitted to copy and distribute verbatim copies
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+  You may convey verbatim copies of the Program's source code as you
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+  7. Additional Terms.
+
+  "Additional permissions" are terms that supplement the terms of this
+License by making exceptions from one or more of its conditions.
+Additional permissions that are applicable to the entire Program shall
+be treated as though they were included in this License, to the extent
+that they are valid under applicable law.  If additional permissions
+apply only to part of the Program, that part may be used separately
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+
+  When you convey a copy of a covered work, you may at your option
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+  Additional terms, permissive or non-permissive, may be stated in the
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+  You may not propagate or modify a covered work except as expressly
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+  However, if you cease all violation of this License, then your
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+  9. Acceptance Not Required for Having Copies.
+
+  You are not required to accept this License in order to receive or
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+  10. Automatic Licensing of Downstream Recipients.
+
+  Each time you convey a covered work, the recipient automatically
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+
+  11. Patents.
+
+  A "contributor" is a copyright holder who authorizes use under this
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+  A contributor's "essential patent claims" are all patent claims
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+  If you convey a covered work, knowingly relying on a patent license,
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+
+  A patent license is "discriminatory" if it does not include within
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+or that patent license was granted, prior to 28 March 2007.
+
+  Nothing in this License shall be construed as excluding or limiting
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+
+  12. No Surrender of Others' Freedom.
+
+  If conditions are imposed on you (whether by court order, agreement or
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+
+  13. Use with the GNU Affero General Public License.
+
+  Notwithstanding any other provision of this License, you have
+permission to link or combine any covered work with a work licensed
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+
+  14. Revised Versions of this License.
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+  The Free Software Foundation may publish revised and/or new versions of
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+be similar in spirit to the present version, but may differ in detail to
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+  Each version is given a distinguishing version number.  If the
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+
+  If the Program specifies that a proxy can decide which future
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+
+  Later license versions may give you additional or different
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+
+  15. Disclaimer of Warranty.
+
+  THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
+APPLICABLE LAW.  EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
+HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
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+  16. Limitation of Liability.
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+  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
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+
+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
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+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
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+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+    <program>  Copyright (C) <year>  <name of author>
+    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<http://www.gnu.org/licenses/>.
+
+  The GNU General Public License does not permit incorporating your program
+into proprietary programs.  If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library.  If this is what you want to do, use the GNU Lesser General
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+<http://www.gnu.org/philosophy/why-not-lgpl.html>.
diff --git a/tools/wheels/LICENSE_win32.txt b/tools/wheels/LICENSE_win32.txt
new file mode 100644
index 000000000..1014d77cd
--- /dev/null
+++ b/tools/wheels/LICENSE_win32.txt
@@ -0,0 +1,938 @@
+
+----
+
+This binary distribution of NumPy also bundles the following software:
+
+
+Name: OpenBLAS
+Files: extra-dll\libopenb*.dll
+Description: bundled as a dynamically linked library
+Availability: https://github.com/xianyi/OpenBLAS/
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+  Redistribution and use in source and binary forms, with or without
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+remove any additional permissions from that copy, or from any part of
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+removal in certain cases when you modify the work.)  You may place
+additional permissions on material, added by you to a covered work,
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+
+  Notwithstanding any other provision of this License, for material you
+add to a covered work, you may (if authorized by the copyright holders of
+that material) supplement the terms of this License with terms:
+
+    a) Disclaiming warranty or limiting liability differently from the
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+
+    b) Requiring preservation of specified reasonable legal notices or
+    author attributions in that material or in the Appropriate Legal
+    Notices displayed by works containing it; or
+
+    c) Prohibiting misrepresentation of the origin of that material, or
+    requiring that modified versions of such material be marked in
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+    d) Limiting the use for publicity purposes of names of licensors or
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+
+    e) Declining to grant rights under trademark law for use of some
+    trade names, trademarks, or service marks; or
+
+    f) Requiring indemnification of licensors and authors of that
+    material by anyone who conveys the material (or modified versions of
+    it) with contractual assumptions of liability to the recipient, for
+    any liability that these contractual assumptions directly impose on
+    those licensors and authors.
+
+  All other non-permissive additional terms are considered "further
+restrictions" within the meaning of section 10.  If the Program as you
+received it, or any part of it, contains a notice stating that it is
+governed by this License along with a term that is a further
+restriction, you may remove that term.  If a license document contains
+a further restriction but permits relicensing or conveying under this
+License, you may add to a covered work material governed by the terms
+of that license document, provided that the further restriction does
+not survive such relicensing or conveying.
+
+  If you add terms to a covered work in accord with this section, you
+must place, in the relevant source files, a statement of the
+additional terms that apply to those files, or a notice indicating
+where to find the applicable terms.
+
+  Additional terms, permissive or non-permissive, may be stated in the
+form of a separately written license, or stated as exceptions;
+the above requirements apply either way.
+
+  8. Termination.
+
+  You may not propagate or modify a covered work except as expressly
+provided under this License.  Any attempt otherwise to propagate or
+modify it is void, and will automatically terminate your rights under
+this License (including any patent licenses granted under the third
+paragraph of section 11).
+
+  However, if you cease all violation of this License, then your
+license from a particular copyright holder is reinstated (a)
+provisionally, unless and until the copyright holder explicitly and
+finally terminates your license, and (b) permanently, if the copyright
+holder fails to notify you of the violation by some reasonable means
+prior to 60 days after the cessation.
+
+  Moreover, your license from a particular copyright holder is
+reinstated permanently if the copyright holder notifies you of the
+violation by some reasonable means, this is the first time you have
+received notice of violation of this License (for any work) from that
+copyright holder, and you cure the violation prior to 30 days after
+your receipt of the notice.
+
+  Termination of your rights under this section does not terminate the
+licenses of parties who have received copies or rights from you under
+this License.  If your rights have been terminated and not permanently
+reinstated, you do not qualify to receive new licenses for the same
+material under section 10.
+
+  9. Acceptance Not Required for Having Copies.
+
+  You are not required to accept this License in order to receive or
+run a copy of the Program.  Ancillary propagation of a covered work
+occurring solely as a consequence of using peer-to-peer transmission
+to receive a copy likewise does not require acceptance.  However,
+nothing other than this License grants you permission to propagate or
+modify any covered work.  These actions infringe copyright if you do
+not accept this License.  Therefore, by modifying or propagating a
+covered work, you indicate your acceptance of this License to do so.
+
+  10. Automatic Licensing of Downstream Recipients.
+
+  Each time you convey a covered work, the recipient automatically
+receives a license from the original licensors, to run, modify and
+propagate that work, subject to this License.  You are not responsible
+for enforcing compliance by third parties with this License.
+
+  An "entity transaction" is a transaction transferring control of an
+organization, or substantially all assets of one, or subdividing an
+organization, or merging organizations.  If propagation of a covered
+work results from an entity transaction, each party to that
+transaction who receives a copy of the work also receives whatever
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+give under the previous paragraph, plus a right to possession of the
+Corresponding Source of the work from the predecessor in interest, if
+the predecessor has it or can get it with reasonable efforts.
+
+  You may not impose any further restrictions on the exercise of the
+rights granted or affirmed under this License.  For example, you may
+not impose a license fee, royalty, or other charge for exercise of
+rights granted under this License, and you may not initiate litigation
+(including a cross-claim or counterclaim in a lawsuit) alleging that
+any patent claim is infringed by making, using, selling, offering for
+sale, or importing the Program or any portion of it.
+
+  11. Patents.
+
+  A "contributor" is a copyright holder who authorizes use under this
+License of the Program or a work on which the Program is based.  The
+work thus licensed is called the contributor's "contributor version".
+
+  A contributor's "essential patent claims" are all patent claims
+owned or controlled by the contributor, whether already acquired or
+hereafter acquired, that would be infringed by some manner, permitted
+by this License, of making, using, or selling its contributor version,
+but do not include claims that would be infringed only as a
+consequence of further modification of the contributor version.  For
+purposes of this definition, "control" includes the right to grant
+patent sublicenses in a manner consistent with the requirements of
+this License.
+
+  Each contributor grants you a non-exclusive, worldwide, royalty-free
+patent license under the contributor's essential patent claims, to
+make, use, sell, offer for sale, import and otherwise run, modify and
+propagate the contents of its contributor version.
+
+  In the following three paragraphs, a "patent license" is any express
+agreement or commitment, however denominated, not to enforce a patent
+(such as an express permission to practice a patent or covenant not to
+sue for patent infringement).  To "grant" such a patent license to a
+party means to make such an agreement or commitment not to enforce a
+patent against the party.
+
+  If you convey a covered work, knowingly relying on a patent license,
+and the Corresponding Source of the work is not available for anyone
+to copy, free of charge and under the terms of this License, through a
+publicly available network server or other readily accessible means,
+then you must either (1) cause the Corresponding Source to be so
+available, or (2) arrange to deprive yourself of the benefit of the
+patent license for this particular work, or (3) arrange, in a manner
+consistent with the requirements of this License, to extend the patent
+license to downstream recipients.  "Knowingly relying" means you have
+actual knowledge that, but for the patent license, your conveying the
+covered work in a country, or your recipient's use of the covered work
+in a country, would infringe one or more identifiable patents in that
+country that you have reason to believe are valid.
+
+  If, pursuant to or in connection with a single transaction or
+arrangement, you convey, or propagate by procuring conveyance of, a
+covered work, and grant a patent license to some of the parties
+receiving the covered work authorizing them to use, propagate, modify
+or convey a specific copy of the covered work, then the patent license
+you grant is automatically extended to all recipients of the covered
+work and works based on it.
+
+  A patent license is "discriminatory" if it does not include within
+the scope of its coverage, prohibits the exercise of, or is
+conditioned on the non-exercise of one or more of the rights that are
+specifically granted under this License.  You may not convey a covered
+work if you are a party to an arrangement with a third party that is
+in the business of distributing software, under which you make payment
+to the third party based on the extent of your activity of conveying
+the work, and under which the third party grants, to any of the
+parties who would receive the covered work from you, a discriminatory
+patent license (a) in connection with copies of the covered work
+conveyed by you (or copies made from those copies), or (b) primarily
+for and in connection with specific products or compilations that
+contain the covered work, unless you entered into that arrangement,
+or that patent license was granted, prior to 28 March 2007.
+
+  Nothing in this License shall be construed as excluding or limiting
+any implied license or other defenses to infringement that may
+otherwise be available to you under applicable patent law.
+
+  12. No Surrender of Others' Freedom.
+
+  If conditions are imposed on you (whether by court order, agreement or
+otherwise) that contradict the conditions of this License, they do not
+excuse you from the conditions of this License.  If you cannot convey a
+covered work so as to satisfy simultaneously your obligations under this
+License and any other pertinent obligations, then as a consequence you may
+not convey it at all.  For example, if you agree to terms that obligate you
+to collect a royalty for further conveying from those to whom you convey
+the Program, the only way you could satisfy both those terms and this
+License would be to refrain entirely from conveying the Program.
+
+  13. Use with the GNU Affero General Public License.
+
+  Notwithstanding any other provision of this License, you have
+permission to link or combine any covered work with a work licensed
+under version 3 of the GNU Affero General Public License into a single
+combined work, and to convey the resulting work.  The terms of this
+License will continue to apply to the part which is the covered work,
+but the special requirements of the GNU Affero General Public License,
+section 13, concerning interaction through a network will apply to the
+combination as such.
+
+  14. Revised Versions of this License.
+
+  The Free Software Foundation may publish revised and/or new versions of
+the GNU General Public License from time to time.  Such new versions will
+be similar in spirit to the present version, but may differ in detail to
+address new problems or concerns.
+
+  Each version is given a distinguishing version number.  If the
+Program specifies that a certain numbered version of the GNU General
+Public License "or any later version" applies to it, you have the
+option of following the terms and conditions either of that numbered
+version or of any later version published by the Free Software
+Foundation.  If the Program does not specify a version number of the
+GNU General Public License, you may choose any version ever published
+by the Free Software Foundation.
+
+  If the Program specifies that a proxy can decide which future
+versions of the GNU General Public License can be used, that proxy's
+public statement of acceptance of a version permanently authorizes you
+to choose that version for the Program.
+
+  Later license versions may give you additional or different
+permissions.  However, no additional obligations are imposed on any
+author or copyright holder as a result of your choosing to follow a
+later version.
+
+  15. Disclaimer of Warranty.
+
+  THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
+APPLICABLE LAW.  EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
+HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
+OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
+THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+PURPOSE.  THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
+IS WITH YOU.  SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
+ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
+
+  16. Limitation of Liability.
+
+  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
+THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+    <program>  Copyright (C) <year>  <name of author>
+    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<http://www.gnu.org/licenses/>.
+
+  The GNU General Public License does not permit incorporating your program
+into proprietary programs.  If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.  But first, please read
+<http://www.gnu.org/philosophy/why-not-lgpl.html>.
\ No newline at end of file
diff --git a/tools/wheels/check_license.py b/tools/wheels/check_license.py
new file mode 100644
index 000000000..0fe7356c0
--- /dev/null
+++ b/tools/wheels/check_license.py
@@ -0,0 +1,55 @@
+#!/usr/bin/env python
+"""
+check_license.py [MODULE]
+
+Check the presence of a LICENSE.txt in the installed module directory,
+and that it appears to contain text prevalent for a NumPy binary
+distribution.
+
+"""
+import os
+import sys
+import io
+import re
+import argparse
+
+
+def check_text(text):
+    ok = "Copyright (c)" in text and re.search(
+        r"This binary distribution of \w+ also bundles the following software",
+        text,
+    )
+    return ok
+
+
+def main():
+    p = argparse.ArgumentParser(usage=__doc__.rstrip())
+    p.add_argument("module", nargs="?", default="numpy")
+    args = p.parse_args()
+
+    # Drop '' from sys.path
+    sys.path.pop(0)
+
+    # Find module path
+    __import__(args.module)
+    mod = sys.modules[args.module]
+
+    # Check license text
+    license_txt = os.path.join(os.path.dirname(mod.__file__), "LICENSE.txt")
+    with io.open(license_txt, "r", encoding="utf-8") as f:
+        text = f.read()
+
+    ok = check_text(text)
+    if not ok:
+        print(
+            "ERROR: License text {} does not contain expected "
+            "text fragments\n".format(license_txt)
+        )
+        print(text)
+        sys.exit(1)
+
+    sys.exit(0)
+
+
+if __name__ == "__main__":
+    main()
diff --git a/tools/wheels/cibw_before_build.sh b/tools/wheels/cibw_before_build.sh
new file mode 100644
index 000000000..5cf7d8088
--- /dev/null
+++ b/tools/wheels/cibw_before_build.sh
@@ -0,0 +1,58 @@
+set -xe
+
+PROJECT_DIR="$1"
+PLATFORM=$(PYTHONPATH=tools python -c "import openblas_support; print(openblas_support.get_plat())")
+
+# Update license
+if [[ $RUNNER_OS == "Linux" ]] ; then
+    cat $PROJECT_DIR/tools/wheels/LICENSE_linux.txt >> $PROJECT_DIR/LICENSE.txt
+elif [[ $RUNNER_OS == "macOS" ]]; then
+    cat $PROJECT_DIR/tools/wheels/LICENSE_osx.txt >> $PROJECT_DIR/LICENSE.txt
+elif [[ $RUNNER_OS == "Windows" ]]; then
+    cat $PROJECT_DIR/tools/wheels/LICENSE_win32.txt >> $PROJECT_DIR/LICENSE.txt
+fi
+
+# Install Openblas
+if [[ $RUNNER_OS == "Linux" || $RUNNER_OS == "macOS" ]] ; then
+    basedir=$(python tools/openblas_support.py)
+    cp -r $basedir/lib/* /usr/local/lib
+    cp $basedir/include/* /usr/local/include
+    if [[ $RUNNER_OS == "macOS" && $PLATFORM == "macosx-arm64" ]]; then
+        sudo mkdir -p /opt/arm64-builds/lib /opt/arm64-builds/include
+        sudo chown -R $USER /opt/arm64-builds
+        cp -r $basedir/lib/* /opt/arm64-builds/lib
+        cp $basedir/include/* /opt/arm64-builds/include
+    fi
+elif [[ $RUNNER_OS == "Windows" ]]; then
+    PYTHONPATH=tools python -c "import openblas_support; openblas_support.make_init('numpy')"
+    target=$(python tools/openblas_support.py)
+    mkdir -p openblas
+    cp $target openblas
+fi
+
+# Install GFortran
+if [[ $RUNNER_OS == "macOS" ]]; then
+    # same version of gfortran as the openblas-libs and numpy-wheel builds
+    curl -L https://github.com/MacPython/gfortran-install/raw/master/archives/gfortran-4.9.0-Mavericks.dmg -o gfortran.dmg
+    GFORTRAN_SHA256=$(shasum -a 256 gfortran.dmg)
+    KNOWN_SHA256="d2d5ca5ba8332d63bbe23a07201c4a0a5d7e09ee56f0298a96775f928c3c4b30  gfortran.dmg"
+    if [ "$GFORTRAN_SHA256" != "$KNOWN_SHA256" ]; then
+        echo sha256 mismatch
+        exit 1
+    fi
+
+    hdiutil attach -mountpoint /Volumes/gfortran gfortran.dmg
+    sudo installer -pkg /Volumes/gfortran/gfortran.pkg -target /
+    otool -L /usr/local/gfortran/lib/libgfortran.3.dylib
+
+    # arm64 stuff from gfortran_utils
+    if [[ $PLATFORM == "macosx-arm64" ]]; then
+        source $PROJECT_DIR/tools/wheels/gfortran_utils.sh
+        install_arm64_cross_gfortran
+    fi
+
+    # Manually symlink gfortran-4.9 to plain gfortran for f2py.
+    # No longer needed after Feb 13 2020 as gfortran is already present
+    # and the attempted link errors. Keep this for future reference.
+    # ln -s /usr/local/bin/gfortran-4.9 /usr/local/bin/gfortran
+fi
diff --git a/tools/wheels/cibw_test_command.sh b/tools/wheels/cibw_test_command.sh
new file mode 100644
index 000000000..b296993fc
--- /dev/null
+++ b/tools/wheels/cibw_test_command.sh
@@ -0,0 +1,19 @@
+# This script is used by .github/workflows/wheels.yml to build wheels with
+# cibuildwheel. It runs the full test suite, checks for lincense inclusion
+# and that the openblas version is correct.
+set -xe
+
+PROJECT_DIR="$1"
+
+python -c "import numpy; numpy.show_config()"
+if [[ $RUNNER_OS == "Windows" ]]; then
+    # GH 20391
+    PY_DIR=$(python -c "import sys; print(sys.prefix)")
+    mkdir $PY_DIR/libs
+fi
+python -c "import sys; import numpy; sys.exit(not numpy.test('full', extra_argv=['-vvv']))"
+
+python $PROJECT_DIR/tools/wheels/check_license.py
+if [[ $UNAME == "Linux" || $UNAME == "Darwin" ]] ; then
+    python $PROJECT_DIR/tools/openblas_support.py --check_version
+fi
diff --git a/tools/wheels/gfortran_utils.sh b/tools/wheels/gfortran_utils.sh
new file mode 100644
index 000000000..e0c7054a5
--- /dev/null
+++ b/tools/wheels/gfortran_utils.sh
@@ -0,0 +1,168 @@
+# This file is vendored from github.com/MacPython/gfortran-install It is
+# licensed under BSD-2 which is copied as a comment below
+
+# Copyright 2016-2021 Matthew Brett, Isuru Fernando, Matti Picus
+
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are met:
+
+# Redistributions of source code must retain the above copyright notice, this
+# list of conditions and the following disclaimer.
+
+# Redistributions in binary form must reproduce the above copyright notice, this
+# list of conditions and the following disclaimer in the documentation and/or
+# other materials provided with the distribution.
+
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+# DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+# SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+# CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+# OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+# Bash utilities for use with gfortran
+
+GF_LIB_URL="https://3f23b170c54c2533c070-1c8a9b3114517dc5fe17b7c3f8c63a43.ssl.cf2.rackcdn.com"
+ARCHIVE_SDIR="${ARCHIVE_SDIR:-archives}"
+
+GF_UTIL_DIR=$(dirname "${BASH_SOURCE[0]}")
+
+function get_distutils_platform {
+    # Report platform as in form of distutils get_platform.
+    # This is like the platform tag that pip will use.
+    # Modify fat architecture tags on macOS to reflect compiled architecture
+
+    # Deprecate this function once get_distutils_platform_ex is used in all
+    # downstream projects
+    local plat=$1
+    case $plat in
+        i686|x86_64|arm64|universal2|intel|aarch64|s390x|ppc64le) ;;
+        *) echo Did not recognize plat $plat; return 1 ;;
+    esac
+    local uname=${2:-$(uname)}
+    if [ "$uname" != "Darwin" ]; then
+        if [ "$plat" == "intel" ]; then
+            echo plat=intel not allowed for Manylinux
+            return 1
+        fi
+        echo "manylinux1_$plat"
+        return
+    fi
+    # macOS 32-bit arch is i386
+    [ "$plat" == "i686" ] && plat="i386"
+    local target=$(echo $MACOSX_DEPLOYMENT_TARGET | tr .- _)
+    echo "macosx_${target}_${plat}"
+}
+
+function get_distutils_platform_ex {
+    # Report platform as in form of distutils get_platform.
+    # This is like the platform tag that pip will use.
+    # Modify fat architecture tags on macOS to reflect compiled architecture
+    # For non-darwin, report manylinux version
+    local plat=$1
+    local mb_ml_ver=${MB_ML_VER:-1}
+    case $plat in
+        i686|x86_64|arm64|universal2|intel|aarch64|s390x|ppc64le) ;;
+        *) echo Did not recognize plat $plat; return 1 ;;
+    esac
+    local uname=${2:-$(uname)}
+    if [ "$uname" != "Darwin" ]; then
+        if [ "$plat" == "intel" ]; then
+            echo plat=intel not allowed for Manylinux
+            return 1
+        fi
+        echo "manylinux${mb_ml_ver}_${plat}"
+        return
+    fi
+    # macOS 32-bit arch is i386
+    [ "$plat" == "i686" ] && plat="i386"
+    local target=$(echo $MACOSX_DEPLOYMENT_TARGET | tr .- _)
+    echo "macosx_${target}_${plat}"
+}
+
+function get_macosx_target {
+    # Report MACOSX_DEPLOYMENT_TARGET as given by distutils get_platform.
+    python -c "import sysconfig as s; print(s.get_config_vars()['MACOSX_DEPLOYMENT_TARGET'])"
+}
+
+function check_gfortran {
+    # Check that gfortran exists on the path
+    if [ -z "$(which gfortran)" ]; then
+        echo Missing gfortran
+        exit 1
+    fi
+}
+
+function get_gf_lib_for_suf {
+    local suffix=$1
+    local prefix=$2
+    local plat=${3:-$PLAT}
+    local uname=${4:-$(uname)}
+    if [ -z "$prefix" ]; then echo Prefix not defined; exit 1; fi
+    local plat_tag=$(get_distutils_platform_ex $plat $uname)
+    if [ -n "$suffix" ]; then suffix="-$suffix"; fi
+    local fname="$prefix-${plat_tag}${suffix}.tar.gz"
+    local out_fname="${ARCHIVE_SDIR}/$fname"
+    if [ ! -e "$out_fname" ]; then
+        curl -L "${GF_LIB_URL}/$fname" > $out_fname || (echo "Fetch of $out_fname failed"; exit 1)
+    fi
+    [ -s $out_fname ] || (echo "$out_fname is empty"; exit 24)
+    echo "$out_fname"
+}
+
+if [ "$(uname)" == "Darwin" ]; then
+    mac_target=${MACOSX_DEPLOYMENT_TARGET:-$(get_macosx_target)}
+    export MACOSX_DEPLOYMENT_TARGET=$mac_target
+    GFORTRAN_DMG="${GF_UTIL_DIR}/archives/gfortran-4.9.0-Mavericks.dmg"
+    export GFORTRAN_SHA="$(shasum $GFORTRAN_DMG)"
+
+    function install_arm64_cross_gfortran {
+        curl -L -O https://github.com/isuruf/gcc/releases/download/gcc-10-arm-20210228/gfortran-darwin-arm64.tar.gz
+        export GFORTRAN_SHA=f26990f6f08e19b2ec150b9da9d59bd0558261dd
+        if [[ "$(shasum gfortran-darwin-arm64.tar.gz)" != "${GFORTRAN_SHA}  gfortran-darwin-arm64.tar.gz" ]]; then
+            echo "shasum mismatch for gfortran-darwin-arm64"
+            exit 1
+        fi
+        sudo mkdir -p /opt/
+        sudo cp "gfortran-darwin-arm64.tar.gz" /opt/gfortran-darwin-arm64.tar.gz
+        pushd /opt
+            sudo tar -xvf gfortran-darwin-arm64.tar.gz
+            sudo rm gfortran-darwin-arm64.tar.gz
+        popd
+        export FC_ARM64="$(find /opt/gfortran-darwin-arm64/bin -name "*-gfortran")"
+        local libgfortran="$(find /opt/gfortran-darwin-arm64/lib -name libgfortran.dylib)"
+        local libdir=$(dirname $libgfortran)
+
+        export FC_ARM64_LDFLAGS="-L$libdir -Wl,-rpath,$libdir"
+        if [[ "${PLAT:-}" == "arm64" ]]; then
+            export FC=$FC_ARM64
+        fi
+    }
+    function install_gfortran {
+        hdiutil attach -mountpoint /Volumes/gfortran $GFORTRAN_DMG
+        sudo installer -pkg /Volumes/gfortran/gfortran.pkg -target /
+        check_gfortran
+        if [[ "${PLAT:-}" == "universal2" || "${PLAT:-}" == "arm64" ]]; then
+            install_arm64_cross_gfortran
+        fi
+    }
+
+    function get_gf_lib {
+        # Get lib with gfortran suffix
+        get_gf_lib_for_suf "gf_${GFORTRAN_SHA:0:7}" $@
+    }
+else
+    function install_gfortran {
+        # No-op - already installed on manylinux image
+        check_gfortran
+    }
+
+    function get_gf_lib {
+        # Get library with no suffix
+        get_gf_lib_for_suf "" $@
+    }
+fi
diff --git a/tools/wheels/upload_wheels.sh b/tools/wheels/upload_wheels.sh
new file mode 100644
index 000000000..46532a5f0
--- /dev/null
+++ b/tools/wheels/upload_wheels.sh
@@ -0,0 +1,58 @@
+set_travis_vars() {
+    # Set env vars
+    echo "TRAVIS_EVENT_TYPE is $TRAVIS_EVENT_TYPE"
+    echo "TRAVIS_TAG is $TRAVIS_TAG"
+    if [[ "$TRAVIS_EVENT_TYPE" == "push" && "$TRAVIS_TAG" == v* ]]; then
+      IS_PUSH="true"
+    else
+      IS_PUSH="false"
+    fi
+    if [[ "$TRAVIS_EVENT_TYPE" == "cron" ]]; then
+      IS_SCHEDULE_DISPATCH="true"
+    elif [[ "$TRAVIS_EVENT_TYPE" == "api" ]]; then
+      # Manual CI run, so upload
+      IS_SCHEDULE_DISPATCH="true"
+    else
+      IS_SCHEDULE_DISPATCH="false"
+    fi
+}
+set_upload_vars() {
+    echo "IS_PUSH is $IS_PUSH"
+    echo "IS_SCHEDULE_DISPATCH is $IS_SCHEDULE_DISPATCH"
+    if [[ "$IS_PUSH" == "true" ]]; then
+        echo push and tag event
+        export ANACONDA_ORG="multibuild-wheels-staging"
+        export TOKEN="$NUMPY_STAGING_UPLOAD_TOKEN"
+        export ANACONDA_UPLOAD="true"
+    elif [[ "$IS_SCHEDULE_DISPATCH" == "true" ]]; then
+        echo scheduled or dispatched event
+        export ANACONDA_ORG="scipy-wheels-nightly"
+        export TOKEN="$NUMPY_NIGHTLY_UPLOAD_TOKEN"
+        export ANACONDA_UPLOAD="true"
+    else
+        echo non-dispatch event
+        export ANACONDA_UPLOAD="false"
+    fi
+}
+upload_wheels() {
+    echo ${PWD}
+    if [[ ${ANACONDA_UPLOAD} == true ]]; then
+        if [ -z ${TOKEN} ]; then
+            echo no token set, not uploading
+        else
+            python -m pip install git+https://github.com/Anaconda-Server/anaconda-client
+            # sdists are located under dist folder when built through setup.py
+            if compgen -G "./dist/*.gz"; then
+                echo "Found sdist"
+                anaconda -t ${TOKEN} upload --skip -u ${ANACONDA_ORG} ./dist/*.gz
+            elif compgen -G "./wheelhouse/*.whl"; then
+                echo "Found wheel"
+                anaconda -t ${TOKEN} upload --skip -u ${ANACONDA_ORG} ./wheelhouse/*.whl
+            else
+                echo "Files do not exist"
+                return 1
+            fi
+            echo "PyPI-style index: https://pypi.anaconda.org/$ANACONDA_ORG/simple"
+        fi
+    fi
+}