how to detect installed gtk variant

[MySchizoBuddy]

For webkit-gtk it has a quartz variant. I want to detect if gtk2 was
installed with the quartz variant or not. if not then spit an error and tell
the users to uninstall gtk and install it with quartz

one problem, since gtk2 is a dependency and i cannot select the variant of
it. the user will be installing gtk2 with X11 and then will have to
uninstall it and reinstall it manually with quartz.
kinda messy. is quartz variant worth the hassle.
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