Index: head/x11-clocks/xfce4-datetime-plugin/Makefile
===================================================================
--- head/x11-clocks/xfce4-datetime-plugin/Makefile	(revision 514048)
+++ head/x11-clocks/xfce4-datetime-plugin/Makefile	(revision 514049)
@@ -1,29 +1,30 @@
 # Created by: Martin Wilke (miwi@FreeBSD.org)
 # $FreeBSD$
 
 PORTNAME=	xfce4-datetime-plugin
 PORTVERSION=	0.8.0
 CATEGORIES=	x11-clocks xfce
 MASTER_SITES=	XFCE/panel-plugins
 DIST_SUBDIR=	xfce4
 
 MAINTAINER=	xfce@FreeBSD.org
 COMMENT=	Datetime panel plugin for the Xfce desktop
 
 LICENSE=	GPLv2
 
-USES=		gettext-tools gmake gnome libtool pkgconfig tar:bzip2 xfce
+USES=		compiler:c11 gettext-tools gmake gnome libtool pkgconfig \
+		tar:bzip2 xfce
 USE_GNOME=	cairo gtk30 intltool
 USE_XFCE=	panel
 
 GNU_CONFIGURE=	yes
 INSTALLS_ICONS=	yes
 INSTALL_TARGET=	install-strip
 
 OPTIONS_DEFINE=		NLS
 OPTIONS_SUB=		yes
 
 NLS_CONFIGURE_ENABLE=	nls
 NLS_USES=		gettext-runtime
 
 .include <bsd.port.mk>