qvfb needs a bump to 4.5.3, as older versions of Qt have security bugs and have been removed from the portage tree. I've had to mask the current versions pending a version bump. If the package is not bumped in 30 days it will need to be removed.
New version submitted to qting-edge. yngwin/hwoarang: please consider adding to the tree.
Committed to the tree. Thanks for your quick response!