Quassel-0.5.2 does not build on a system without X, contrary to the earlier versions. (I.e. I'm trying to build just the quasselcore, with USE="-X server"). In spite of the useflags it tries to find X, and fails.
Created attachment 216976 [details] build.log
Please sync your portage tree. This error is already fixed. Please reopen if there are still issues.