Index: head/textproc/libnumbertext/Makefile
===================================================================
--- head/textproc/libnumbertext/Makefile	(revision 495746)
+++ head/textproc/libnumbertext/Makefile	(revision 495747)
@@ -1,19 +1,19 @@
 # $FreeBSD$
 
 PORTNAME=	libnumbertext
 PORTVERSION=	1.0.5
 CATEGORIES=	textproc
 MASTER_SITES=	https://github.com/Numbertext/libnumbertext/releases/download/${PORTVERSION}/
 
 MAINTAINER=	lwhsu@FreeBSD.org
 COMMENT=	Number to number name and money text conversion libraries
 
 LICENSE=	BSD3CLAUSE
 LICENSE_FILE=	${WRKSRC}/COPYING
 
-USES=	gmake libtool tar:xz
+USES=		compiler:c++11-lang gmake libtool tar:xz
 
 GNU_CONFIGURE=	yes
 USE_LDCONFIG=	yes
 
 .include <bsd.port.mk>