Warning: This is probably a noob question, I just replaced Debian on my Desktop with Funtoo...
Now I try to allow Python 2 and 3 to coexist peacefully. The main problem are the python_single_target_pythonX_X use flags. A lot of packages need exactly one of them specified. But some require Python 2 and some Python 3.
In /etc/portage/make.conf I specified
PYTHON_TARGETS="python2_7 python3_4"
PYTHON_SINGLE_TARGET="python3_4"
If I add python2_7 as single target, some ebuilds start complaining about needing exacly one of the two but not both specified. But if I don't add python2_7, ebui