pypa/pip — pull request #472 by pnasrat (2012-03-04 12:53:16+00:00)
Title: Issue #440 using user site with installed.

Tested on 2.4 (fedora 16), 2.7 (fedora 16) - atexit fail but tests pass,

Seeing some fragility on 2.6 OS X and in 3.2 on f16 but think environmental (mercurial tests complaining).