pypa/pip — pull request #1344 by qwcode (2013-11-24 23:33:00+00:00)
Title: fix for certain platforms/versions not having `os.O_NOFOLLOW`

fix for #849.
this is critical for the PEP453 effort in python 3.4: http://bugs.python.org/issue19749

needs confirmation from another person, as it contains a fair amount of tedium
I did add new tests.

cc @d1b