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I really don't understand the background or why this worked since I know nothing about perl. But I ran # perl-cleaner --all -- --backtrack=30 which solved the problem for me. I found this solution in a Gentoo bug: https://bugs.gentoo.org/show_bug.cgi?id=506616 Hope it works for you, too.

Great, thanks! Didn't know this. This makes the whole thing a lot tidier. But now, what's the best practise to use those file. Do I create one file per package or one file per install (with all it's dependencies). How do you do this?

Sorry about yet another noob question from me. I somehow lost the overview of the contents in my /etc/portage/package.use file. There are a lot of entries that were asked for by some package I installed. So the file grows and grows. How do you keep this file tidy? How do you know what entries are still required and which became obsolete over time (and a few @world upgrades)?

Thanks @Mike! I removed these use flags, ran python-updater and did a 'emerge -uND @world' and everything seems to work now. I don't really know why I set those USE flags in the first place.

Here my system info: uname -a output: Linux localhost 3.14.4-1 #1 SMP Thu May 22 19:38:12 CEST 2014 x86_64 Intel(R) Core(TM) i7 CPU Q 740 @ 1.73GHz GenuineIntel GNU/Linux Desktop: KDE (with the KDE mix-in) Mouse: USB Roccat Kone Keyboard: USB Das Keyboard Ultimate Everything kept working without a reboot but I rebooted anyway. I also attached my dmesg if there is anything in there you want to know. Hope this helps. dmesg.txt

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, ebuilds that depend on Python 2 won't build. The only solution I found was to specify the use flag for every single application in /etc/portage/package.use like this: app-office/libreoffice python_single_target_python2_7 But that's a lot of lines to add to that file and I figured there has to be a easier way to do this. I tried to find some documentation about Python on Gentoo but wasn't lucky. When I try to install ports that depend on Python 2 or when I try to do a 'emerge -uND @world' I get this error: The following REQUIRED_USE flag constraints are unsatisfied: python_single_target_python2_7 Thank you, Beni

It was just a glitch in the Matrix. The second boot everything worked as before.

I just upgraded my KDE system. Until now everything seems to work. The only thing that happend was that the mouse didn't work. But unplugging and replugging it helped. I have to check next boot whether this happens regularly or whether it was just a glitch - this happens, because it's a Roccat Kone which doesn't alway work without troubles anyway.