Index: head/x11/kanshi/Makefile
===================================================================
--- head/x11/kanshi/Makefile	(revision 508585)
+++ head/x11/kanshi/Makefile	(revision 508586)
@@ -1,30 +1,30 @@
 # $FreeBSD$
 
 PORTNAME=	kanshi
 PORTVERSION=	s20190607
 CATEGORIES=	x11
 
 MAINTAINER=	jbeich@FreeBSD.org
 COMMENT=	Dynamic display configuration for Wayland
 
 LICENSE=	MIT
 # https://github.com/emersion/kanshi/issues/45
 #LICENSE_FILE=	${WRKSRC}/LICENSE
 
 LIB_DEPENDS=	libwayland-client.so:graphics/wayland
 
-USES=		meson pkgconfig
+USES=		compiler:c11 meson pkgconfig
 USE_GITHUB=	yes
 GH_ACCOUNT=	emersion
 GH_TAGNAME=	76e9f41
 PLIST_FILES=	bin/${PORTNAME}
 
 OPTIONS_DEFINE=	MANPAGES
 OPTIONS_DEFAULT=MANPAGES
 
 MANPAGES_BUILD_DEPENDS=	scdoc:textproc/scdoc
 MANPAGES_MESON_ENABLED=	man-pages
 MANPAGES_PLIST_FILES=	man/man1/${PORTNAME}.1.gz \
 			man/man5/${PORTNAME}.5.gz
 
 .include <bsd.port.mk>