SVN commit 10337 by rakuco:
qmake5: Stop setting QMAKE_{INC,LIB}DIR_{OPENGL,X11}.
These days they're not installed in X11R6 anymore, so there's no point in
setting them again. I've also done the same thing upstream to the
unsupported/freebsd-clang mkspec.
M +1 -5 patch-mkspecs__common__freebsd.conf