diff --git a/net/xorp-devel/Makefile b/net/xorp-devel/Makefile
index dfb52491292b..18d421726edf 100644
--- a/net/xorp-devel/Makefile
+++ b/net/xorp-devel/Makefile
@@ -58,6 +58,10 @@ do-fetch:
 
 .include <bsd.port.pre.mk>
 
+.if ${OSVERSION} < 700000
+IGNORE=		unsupported on FreeBSD versions prior to 7.0
+.endif
+
 XORP_GROUP=	xorp
 USE_RC_SUBR=	xorp