Index: head/Mk/bsd.port.mk
===================================================================
--- head/Mk/bsd.port.mk
+++ head/Mk/bsd.port.mk
@@ -1416,11 +1416,13 @@
 .include "${PORTSDIR}/Mk/bsd.gecko.mk"
 .endif
 
-.if defined(USE_GNOME) || defined(INSTALLS_ICONS)
+.if (defined(USE_GNOME) || defined(INSTALLS_ICONS)) && empty(USES:Mgnome)
+DEV_WARNING+=	"Using USE_GNOME alone is deprecated, please add USES=gnome."
 USES+=	gnome
 .endif
 
-.if defined(USE_MATE)
+.if defined(USE_MATE) && empty(USES:Mmate)
+DEV_WARNING+=	"Using USE_MATE alone is deprecated, please add USES=mate."
 USES+=	mate
 .endif