pypa/pip — pull request #599 by claymation (2012-07-13 03:04:42+00:00)
Title: Remove temp build dir even if the req is not installed (fixes #420)

This change ensures that `RequirementSet.cleanup_files()` is called whenever `req_to_install._temp_build_dir` is defined, preventing detritus from accumulating in `$TMPDIR`.