Index: head/audio/vmpk/Makefile
===================================================================
--- head/audio/vmpk/Makefile	(revision 488231)
+++ head/audio/vmpk/Makefile	(revision 488232)
@@ -1,29 +1,29 @@
 # $FreeBSD$
 
 PORTNAME=	vmpk
 DISTVERSION=	0.7.1
 CATEGORIES=	audio
 MASTER_SITES=	https://phoenixnap.dl.sourceforge.net/project/vmpk/vmpk/${PORTVERSION}/
 
 MAINTAINER=	yuri@FreeBSD.org
 COMMENT=	Virtual MIDI Piano Keyboard
 
 LICENSE=	GPLv3
 LICENSE_FILE=	${WRKSRC}/COPYING
 
 LIB_DEPENDS=	libdrumstick-rt.so:audio/drumstick
 
-USES=		cmake:outsource pkgconfig qt:5 tar:bz2
+USES=		compiler:c++11-lang cmake:outsource pkgconfig qt:5 tar:bz2
 USE_QT=		core gui network svg widgets x11extras \
 		buildtools_build linguisttools_build qmake_build
 USE_XORG=	xcb
 
 CMAKE_OFF=	XSLTPROC_EXECUTABLE
 
 OPTIONS_DEFINE=	DBUS
 OPTIONS_SUB=		yes
 
 DBUS_CMAKE_BOOL=	ENABLE_DBUS
 DBUS_USE=	qt=dbus
 
 .include <bsd.port.mk>