Index: head/x11/libexo/Makefile
===================================================================
--- head/x11/libexo/Makefile	(revision 513406)
+++ head/x11/libexo/Makefile	(revision 513407)
@@ -1,47 +1,47 @@
 # Created by: Matt Lancereau
 # $FreeBSD$
 
 PORTNAME=	libexo
 PORTVERSION=	0.12.8
 CATEGORIES=	x11 xfce
 MASTER_SITES=	XFCE
 DISTNAME=	exo-${DISTVERSIONFULL}
 DIST_SUBDIR=	xfce4
 
 MAINTAINER=	xfce@FreeBSD.org
 COMMENT=	Application library for the Xfce desktop environment
 
 LICENSE=	GPLv2 LGPL21
 LICENSE_COMB=	multi
 LICENSE_FILE_GPLv2=	${WRKSRC}/COPYING
 LICENSE_FILE_LGPL21=	${WRKSRC}/COPYING.LIB
 
 LIB_DEPENDS=	libfontconfig.so:x11-fonts/fontconfig \
 		libfreetype.so:print/freetype2
 BUILD_DEPENDS=	p5-URI>=1.70:net/p5-URI
 RUN_DEPENDS=	p5-URI>=1.70:net/p5-URI
 
-USES=		desktop-file-utils gettext-tools gmake gnome libtool pathfix \
-		perl5 pkgconfig tar:bzip2 xfce xorg
+USES=		compiler:c11 desktop-file-utils gettext-tools gmake gnome \
+		libtool pathfix perl5 pkgconfig tar:bzip2 xfce xorg
 USE_GNOME=	cairo glib20 gtk30 intltool
 USE_LDCONFIG=	yes
 USE_XFCE=	libmenu
 USE_XORG=	ice sm x11
 
 WRKSRC=		${WRKDIR}/${DISTNAME}
 GNU_CONFIGURE=	yes
 INSTALLS_ICONS=	yes
 INSTALL_TARGET=	install-strip
 CONFIGURE_ARGS=	--without-html-dir --disable-silent-rules
 
 OPTIONS_DEFINE=	GTK2 NLS
 OPTIONS_DEFAULT=	GTK2
 OPTIONS_SUB=	yes
 
 GTK2_USE=	gnome=gtk20
 GTK2_CONFIGURE_ENABLE=	gtk2
 
 NLS_CONFIGURE_ENABLE=	nls
 NLS_USES=		gettext-runtime
 
 .include <bsd.port.mk>