Index: head/security/fastd/Makefile
===================================================================
--- head/security/fastd/Makefile	(revision 402992)
+++ head/security/fastd/Makefile	(revision 402993)
@@ -1,28 +1,35 @@
 # $FreeBSD$
 
 PORTNAME=		fastd
 PORTVERSION=		17
 CATEGORIES=		security net
 MASTER_SITES=		http://git.universe-factory.net/fastd/snapshot/
 
 MAINTAINER=		crest_maintainer@rlwinm.de
 COMMENT=		Fast and Secure Tunnelling Daemon
 
 LICENSE=		BSD2CLAUSE
 LICENSE_FILE=		${WRKSRC}/COPYRIGHT
 
 LIB_DEPENDS=		libjson-c.so:${PORTSDIR}/devel/json-c       \
 			libsodium.so:${PORTSDIR}/security/libsodium \
 			libuecc.so:${PORTSDIR}/security/libuecc
 
 USES=			bison cmake:outsource pkgconfig tar
 
 USE_RC_SUBR=		fastd
 
 PLIST_FILES=		bin/fastd           \
 			man/man1/fastd.1.gz
 
+.include <bsd.port.pre.mk>
+
+# GCC from base does not support -mpclmul.
+.if ${OPSYS} == FreeBSD && ${OSVERSION} < 1000024
+CMAKE_ARGS+=		-DWITH_MAC_GHASH_PCLMULQDQ=FALSE
+.endif
+
 post-install:
 	${INSTALL_MAN} ${WRKSRC}/doc/fastd.1 ${STAGEDIR}${PREFIX}/man/man1
 
-.include <bsd.port.mk>
+.include <bsd.port.post.mk>
Index: head/security/fastd-devel/Makefile
===================================================================
--- head/security/fastd-devel/Makefile	(revision 402992)
+++ head/security/fastd-devel/Makefile	(revision 402993)
@@ -1,33 +1,40 @@
 # $FreeBSD$
 
 PORTNAME=		fastd
 PORTVERSION=		18.a.20151111
 CATEGORIES=		security net
 MASTER_SITES=		http://git.universe-factory.net/fastd/snapshot/
 PKGNAMESUFFIX=		-devel
 DISTNAME=		999b87b80302dbc14e23ef3dff187b91dae7fab5
 
 MAINTAINER=		crest_maintainer@rlwinm.de
 COMMENT=		Fast and Secure Tunnelling Daemon
 
 LICENSE=		BSD2CLAUSE
 LICENSE_FILE=		${WRKSRC}/COPYRIGHT
 
 LIB_DEPENDS=		libjson-c.so:${PORTSDIR}/devel/json-c       \
 			libsodium.so:${PORTSDIR}/security/libsodium \
 			libuecc.so:${PORTSDIR}/security/libuecc
 
 USES=			bison cmake:outsource pkgconfig tar
 
 PKG_CONFIG_PATH=	${PREFIX}/lib/pkgconfig/
 CONFIGURE_ENV+=		PKG_CONFIG_PATH=${PKG_CONFIG_PATH}
 
 USE_RC_SUBR=		fastd_devel
 
 PLIST_FILES=		bin/fastd-devel           \
 			man/man1/fastd-devel.1.gz
 
+.include <bsd.port.pre.mk>
+
+# GCC from base does not support -mpclmul.
+.if ${OPSYS} == FreeBSD && ${OSVERSION} < 1000024
+CMAKE_ARGS+=		-DWITH_MAC_GHASH_PCLMULQDQ=FALSE
+.endif
+
 post-install:
 	${INSTALL_MAN} ${WRKSRC}/doc/fastd.1 ${STAGEDIR}${PREFIX}/man/man1/fastd-devel.1
 
-.include <bsd.port.mk>
+.include <bsd.port.post.mk>