After gtk-2.4.0 commit, the dependency ${X11BASE}/lib/gtk-2.0/2.2.0/engines/libxfce.so:${PORTSDIR}/x11-toolkits/gtk-xfce-engine is wrong. Should be ${X11BASE}/lib/gtk-2.0/2.4.0/engines/libxfce.so:${PORTSDIR}/x11-toolkits/gtk-xfce-engine