Hard dep on six==1.1.0 somewhere on the dependency tree avoids installation

$ sudo LEAP_VENV_SKIP_PYSIDE=1 python2 setup.py install <...> Processing leap.bitmask-0.3.1-py2.7.egg removing '/usr/lib/python2.7/site-packages/leap.bitmask-0.3.1-py2.7.egg' (and everything under it) creating /usr/lib/python2.7/site-packages/leap.bitmask-0.3.1-py2.7.egg Extracting leap.bitmask-0.3.1-py2.7.egg to /usr/lib/python2.7/site-packages leap.bitmask 0.3.1 is already the active version in easy-install.pth Installing bitmask script to /usr/bin

Installed /usr/lib/python2.7/site-packages/leap.bitmask-0.3.1-py2.7.egg Processing dependencies for leap.bitmask==0.3.1 error: Installed distribution six 1.4.1 conflicts with requirement six==1.1.0

(from redmine: created on 2013-09-04, closed on 2013-09-09, duplicates #3753 (closed))