Index: head/audio/rtaudio/Makefile
===================================================================
--- head/audio/rtaudio/Makefile	(revision 503882)
+++ head/audio/rtaudio/Makefile	(revision 503883)
@@ -1,20 +1,20 @@
 # $FreeBSD$
 
 PORTNAME=	rtaudio
 DISTVERSION=	5.1.0
 CATEGORIES=	audio
 
 MAINTAINER=	yuri@FreeBSD.org
 COMMENT=	C++ classes that provide a common API for realtime audio input/output
 
 LICENSE=	MIT
 
-USES=		autoreconf libtool pkgconfig
+USES=		autoreconf compiler:c++11-lang libtool pkgconfig
 USE_GITHUB=	yes
 GH_ACCOUNT=	thestk
 GNU_CONFIGURE=	yes
 CONFIGURE_ARGS=	--disable-static
 USE_LDCONFIG=	yes
 INSTALL_TARGET=	install-strip
 
 .include <bsd.port.mk>