Index: head/net/nng/Makefile
===================================================================
--- head/net/nng/Makefile	(revision 500812)
+++ head/net/nng/Makefile	(revision 500813)
@@ -1,21 +1,21 @@
 # $FreeBSD$
 
 PORTNAME=	nng
 DISTVERSIONPREFIX=	v
 DISTVERSION=	1.1.1
 CATEGORIES=	net
 
 MAINTAINER=	swills@FreeBSD.org
 COMMENT=	Lightweight, broker-less messaging
 
 LICENSE=	MIT
 LICENSE_FILE=	${WRKSRC}/LICENSE.txt
 
-USES=		cmake
+USES=		cmake compiler:c11
 USE_GITHUB=	yes
 GH_ACCOUNT=	nanomsg
 
 CMAKE_ARGS+=	-DBUILD_SHARED_LIBS:BOOL=ON
 USE_LDCONFIG=	yes
 
 .include <bsd.port.mk>