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diff --git a/numpy/doc/cython/Python.pxi b/numpy/doc/cython/Python.pxi
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+# :Author:    Robert Kern
+# :Copyright: 2004, Enthought, Inc.
+# :License:   BSD Style
+
+
+cdef extern from "Python.h":
+    # Not part of the Python API, but we might as well define it here.
+    # Note that the exact type doesn't actually matter for Pyrex.
+    ctypedef int size_t
+
+    # Some type declarations we need
+    ctypedef int Py_intptr_t
+
+
+    # String API
+    char* PyString_AsString(object string)
+    char* PyString_AS_STRING(object string)
+    object PyString_FromString(char* c_string)
+    object PyString_FromStringAndSize(char* c_string, int length)
+    object PyString_InternFromString(char *v)
+
+    # Float API
+    object PyFloat_FromDouble(double v)
+    double PyFloat_AsDouble(object ob)
+    long PyInt_AsLong(object ob)
+
+
+    # Memory API
+    void* PyMem_Malloc(size_t n)
+    void* PyMem_Realloc(void* buf, size_t n)
+    void PyMem_Free(void* buf)
+
+    void Py_DECREF(object obj)
+    void Py_XDECREF(object obj)
+    void Py_INCREF(object obj)
+    void Py_XINCREF(object obj)
+
+    # CObject API
+    ctypedef void (*destructor1)(void* cobj)
+    ctypedef void (*destructor2)(void* cobj, void* desc)
+    int PyCObject_Check(object p)
+    object PyCObject_FromVoidPtr(void* cobj, destructor1 destr)
+    object PyCObject_FromVoidPtrAndDesc(void* cobj, void* desc, 
+        destructor2 destr)
+    void* PyCObject_AsVoidPtr(object self)
+    void* PyCObject_GetDesc(object self)
+    int PyCObject_SetVoidPtr(object self, void* cobj)  
+
+    # TypeCheck API
+    int PyFloat_Check(object obj)
+    int PyInt_Check(object obj)
+
+    # Error API
+    int PyErr_Occurred()
+    void PyErr_Clear()
+    int  PyErr_CheckSignals()
+
+cdef extern from "string.h":
+    void *memcpy(void *s1, void *s2, int n)
+
+cdef extern from "math.h":
+    double fabs(double x)