I think GTK3 should be good to go as it should have mainline Wayland support. I would say some mucking with GTK3 packages from Fedora/OpenSuse in Mer OBS should do the job. GTK2 is more complicated as it does not support Wayland, so XWayland will be needed first for it to work. Hacking it work directly with Wayland might not be an option, as at least GDK is directly using & exposing (I've actually used some of that in modRana ) a lot of X stuff. Still, GTK is IMHO not that suitable for mobile GUI development. Sure, it is possible, but it is quite a masochistic exercise, provided there are better suited alternatives available, such as Qt.