In the meantime, I'll post the results with gtk2-compat. Tomorrow I'll redo the tests with gtk2, as I've reached the maximum number of builds available to me for today. :)

suil error: Failed to open module /usr/local/lib/suil-0/libsuil_x11_in_gtk2.so (/usr/local/lib/suil-0/libsuil_x11_in_gtk2.so: cannot open shared object file: No such file or directory)