pyflakes version conflic

[jma]

When I install kwalitee from github:
pip install -e git+git://github.com/inveniosoftware/kwalitee.git#egg=kwalite
and I run kwalitee, I got:
pkg_resources.VersionConflict: (pyflakes 1.0.0 (/Users/marietho/Devel/Virtualenvs/test/lib/python2.7/site-packages), Requirement.parse('pyflakes>=1.5.0,<1.6.0'))

[gsemet]

same here on all my projects. look like conflicts between 2 dependencies