Index: www/linux-seamonkey/Makefile.common
===================================================================
--- www/linux-seamonkey/Makefile.common
+++ www/linux-seamonkey/Makefile.common
@@ -1,9 +1,8 @@
 # Created by: Andrew Pantyukhin <infofarmer@FreeBSD.org>
 # $FreeBSD$
-.undef WANT_GTK218
 .if defined(OVERRIDE_LINUX_NONBASE_PORTS) && \
-    ${OVERRIDE_LINUX_NONBASE_PORTS} == "f10"
-.def WANT_GTK218
+    ${OVERRIDE_LINUX_NONBASE_PORTS} != "f10"
+.undef WANT_GTK218
 .endif
 
 CATEGORIES+=	linux