arts fails to merge: checking for Qt... configure: error: Qt (>= Qt 3.3 and < 4.0) (headers and libraries) not found. Please check your installation! The ebuild specifies dependency on >= qt-3.3 only. The latest version of qt is 4.1.2, which arts will not build against. The ebuild should specify dependency < qt-4.0
Attach config.log here and post emerge --info. The dependencies are correct.
Created attachment 88497 [details] config.log config.log as requested (sorry, missed the instructions from portage the first time).
Reopening with requested info.
do you have a qt-3 version installed?
It appears I didn't. It was a version of qt4. But here's the odd thing: I never explicitly upgraded to qt4, and I didn't have anything qt related in my keywords file set to ~amd64. So I'm guessing something else in stable must've pulled in qt4, breaking other stuff. Not sure what it was though, so I'll just mark this resolved. Thanks.
having qt4 shouldn't matter though. arts should have pulled in qt-3 regardless. both can be installed at the same time.