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Let's change this to pkgconfig(gtk+-2.0), gtk+-2.0 is more likely to be the one people will search for when it comes to rebuilds and the likes.
I'm guessing it needs glxinfo and probably not glxgears yea? IMO would probably just make more sense to move glxinfo into mesalib itself and just keep mesa-demos for glxgears (or even just have a package literally for glxgears via splitting).