If QT was compiled with opengl support other QT application won't build. When emerging a qt application, configure script generate a little source code to check if QT works. This script don't try to link with opengl, so compilation failed. Reproducible: Always Steps to Reproduce: 1. export USE="opengl" 2. emerge qt 3. emerge arts (or any qt app) Actual Results: Arts compilation failed (said that qt-mt can't be find). Expected Results: Arts compilation success ;) I search a lot of time to find where it come from. solution was : export USE="-opengl" emerge qt
That may be the case, but it;s an issue with opengl and not with Qt. Are you using the nvidia drivers?
*** This bug has been marked as a duplicate of 38471 ***