--- Makefile	(revision 486250)
+++ Makefile	(working copy)
@@ -14,7 +14,8 @@ 
 LIB_DEPENDS=	libfluidsynth.so:audio/fluidsynth
 RUN_DEPENDS=	${LOCALBASE}/share/sounds/sf2/FluidR3_GM.sf2:audio/fluid-soundfont
 
-USES=		cmake:outsource pkgconfig qt:5 shared-mime-info tar:bz2
+USES=		compiler:c++11-lang cmake:outsource pkgconfig qt:5 \
+		shared-mime-info tar:bz2
 USE_QT=		core gui network svg testlib widgets buildtools_build qmake_build
 USE_LDCONFIG=	yes