Index: head/deskutils/gnome-clocks/Makefile
===================================================================
--- head/deskutils/gnome-clocks/Makefile	(revision 551581)
+++ head/deskutils/gnome-clocks/Makefile	(revision 551582)
@@ -1,34 +1,34 @@
 # Created by: Gustau Perez <gustau.perez@gmail.com>
 # $FreeBSD$
 
 PORTNAME=	gnome-clocks
 PORTVERSION=	3.38.0
 CATEGORIES=	deskutils gnome
 MASTER_SITES=	GNOME
 DIST_SUBDIR=	gnome
 
 MAINTAINER=	gnome@FreeBSD.org
 COMMENT=	Clocks for GNOME 3
 
 LICENSE=	GPLv2
 LICENSE_FILE=	${WRKSRC}/LICENSE.md
 
 BUILD_DEPENDS=	itstool:textproc/itstool \
 		vala:lang/vala
 LIB_DEPENDS=	libgeoclue-2.so:net/geoclue \
 		libgeocode-glib.so:net/geocode-glib \
 		libgweather-3.so:net/libgweather \
 		libhandy-1.so:x11-toolkits/libhandy
 
 PORTSCOUT=	limitw:1,even
 
-USES=		gettext gnome localbase meson pkgconfig python:3.4+,build \
-		shebangfix tar:xz
+USES=		compiler:c11 gettext gnome localbase meson pkgconfig \
+		python:3.4+,build shebangfix tar:xz
 USE_LDCONFIG=	yes
 USE_GNOME=	cairo gnomedesktop3 gsound
 INSTALLS_ICONS=	yes
 SHEBANG_FILES=	build-aux/post-install.py
 
 GLIB_SCHEMAS=	org.gnome.clocks.gschema.xml
 
 .include <bsd.port.mk>