I've merged media-video/nvidia-glx and switched to nvidia openGL libs. After that I was unable to compile qt and gle libraries, switching back to regular xfree openGL libraries solve this issue. After sucessfull compilation everything works properly even with nvidia openGL libraries. Workaround: 1. turn of nvidia openGL libs (opengl-update xfree) 2. compile affected libraries 3. turn on nvidia openGL libs (opengl-update nvidia)
open bug reports about specific packages and include compile errors ive fixed many packages so that they work with nvidia and xfree gl implementations ... but ive only fixed the ones ive noticed (i used nvidia on my system ...)