Index: head/devel/libpru/Makefile
===================================================================
--- head/devel/libpru/Makefile	(revision 374568)
+++ head/devel/libpru/Makefile	(revision 374569)
@@ -1,17 +1,27 @@
 # $FreeBSD$
 
 PORTNAME=	libpru
 PORTVERSION=	0.1
 CATEGORIES=	devel
 MASTER_SITES=	https://bitbucket.org/rpaulo/libpru/get/
 
 MAINTAINER=	rpaulo@FreeBSD.org
 COMMENT=	Library to interface with PRUs
 
 LICENSE=	BSD2CLAUSE
 
+.include <bsd.port.options.mk>
+
+.if ${OPSYS} != FreeBSD
+IGNORE=	Only supported on FreeBSD
+.endif
+
+.if ${OSVERSION} < 1000510
+IGNORE=	Only supported on FreeBSD 10+
+.endif
+
 USES=		cmake
 
 WRKSRC=		${WRKDIR}/rpaulo-libpru-e1aae0486927
 
 .include <bsd.port.mk>