Merge from default.

1 files changed, 3 insertions, 2 deletions

diff --git a/setuptools/command/develop.py b/setuptools/command/develop.py
index 07b66ccb..11b5df10 100755
--- a/setuptools/command/develop.py
+++ b/setuptools/command/develop.py
@@ -5,9 +5,10 @@ import os
 import glob
 import io
 
+from setuptools.extern import six
+
 from pkg_resources import Distribution, PathMetadata, normalize_path
 from setuptools.command.easy_install import easy_install
-from setuptools.compat import PY3
 import setuptools
 
 
@@ -87,7 +88,7 @@ class develop(easy_install):
                 " installation directory", p, normalize_path(os.curdir))
 
     def install_for_development(self):
-        if PY3 and getattr(self.distribution, 'use_2to3', False):
+        if six.PY3 and getattr(self.distribution, 'use_2to3', False):
             # If we run 2to3 we can not do this inplace:
 
             # Ensure metadata is up-to-date