Index: head/sysutils/tmate/Makefile
===================================================================
--- head/sysutils/tmate/Makefile	(revision 543785)
+++ head/sysutils/tmate/Makefile	(revision 543786)
@@ -1,24 +1,24 @@
 # $FreeBSD$
 
 PORTNAME=	tmate
 PORTVERSION=	2.4.0
 CATEGORIES=	sysutils
 
 MAINTAINER=	swills@FreeBSD.org
 COMMENT=	Instant terminal sharing
 
 LIB_DEPENDS=	libevent.so:devel/libevent \
 		libmsgpackc.so:devel/msgpack \
 		libssh.so:security/libssh
 
-USES=		autoreconf ncurses pkgconfig
+USES=		autoreconf compiler:c11 ncurses pkgconfig
 USE_GITHUB=	yes
 GH_ACCOUNT=	tmate-io
 
 GNU_CONFIGURE=	yes
 USE_LDCONFIG=	yes
 LDFLAGS+=	-lexecinfo
 
 PLIST_FILES=	bin/tmate man/man1/tmate.1.gz
 
 .include <bsd.port.mk>