Created attachment 368318 [details, diff] patch for ebuild Added USE python: checked enabling and disabling with python2.7 and disabling with python3.3 - works fine. eigen3 works fine too and is DEPEND only. opengl needs gtk or qt, added missing deps. opencv is able to use gtk or qt, but not both. If tbb is enabled, cmake build system will disable openmp.
Unless you go through all the reverse dependencies and figure out which ones need python and which not, I'll at most commit this with python default on.
Mostly done in 2.4.8