For this to work on wayland, it would need to build against gtk3, and any xlib calls would need to be wrapped in backend checks:  http://developer.gnome.org/gtk3/3.3/ch24s02.html#id1502079
http://wayland.freedesktop.org/gtk.html

Would be nice to have something other than the demo terminal and vte working, and it looks like this one is pretty close.