My point is that a lean build of GTK3 doesn't require more than GTK2 right now does. In the port linked to, libepoxy and libcolord can be avoided. And when you

My point is that a lean build of GTK3 doesn't require more than GTK2 right now does. In the port linked to, libepoxy and libcolord can be avoided. And when you do that, it's down to what GTK2 depends on in its default build config on most Linux distros. If you could disable ATK, you could shave off some more, but GTK3 doesn't build without ATK.