AC_SUBST(XEXT_LIBS)
# Checks GTK+ 3.0
-PKG_CHECK_MODULES(GTK, gtk+-3.0)
+PKG_CHECK_MODULES(GTK, [gtk+-3.0 >= 3.12])
# ensure that only allowed headers are included
GTK_CFLAGS+=" -DGTK_DISABLE_SINGLE_INCLUDES "
# ensure that no gtk deprecated symbols are used