[mythtv] Unable to compile HEAD w/ QT 5.4 on gentoo, can't seem to force qt 4.8 either

[Mitch Capper]

I am running into an issue compiling the latest mythtv HEAD working on qt
5.4 due to: undefined reference to `typeinfo for MythRenderOpenGL' when
linking  http://pastebin.com/ZkzS4L9S

I also tried switching back to QT 4.8 however while both are installed on
the system (and I set the system to QT 4.8, so qmake --version reports
that) mythtv still seems to reference qt 5.4.

~Mitch
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