The Qt plug-in does not respect installs when the ROOT sources have been
configured with the `--prefix' option. The problem is in `qt/src/TGQt.cxx'.
I've attached a patch that fixes the problem.


git-svn-id: http://root.cern.ch/svn/root/trunk@16651 27541ba8-7e3a-0410-8455-c3a389f83636