Index: head/audio/raul/Makefile
===================================================================
--- head/audio/raul/Makefile	(revision 538469)
+++ head/audio/raul/Makefile	(revision 538470)
@@ -1,25 +1,25 @@
 # Created by: Edward Tomasz Napierala <trasz@FreeBSD.org>
 # $FreeBSD$
 
 PORTNAME=	raul
 PORTVERSION=	0.8.0.20191209
 CATEGORIES=	audio
 
 MAINTAINER=	yuri@FreeBSD.org
 COMMENT=	Realtime modular synthesizer and/or effects processor
 
 LICENSE=	GPLv3
 LICENSE_FILE=	${WRKSRC}/COPYING
 
 BUILD_DEPENDS=	lv2>0:audio/lv2 \
 		${LOCALBASE}/include/fftw3.h:math/fftw3
 
-USES=		waf
+USES=		compiler:c++11-lang waf
 USE_GITHUB=	yes
 GH_ACCOUNT=	drobilla
 GH_TAGNAME=	e87bb398f025912fb989a09f1450b838b251aea1
 GH_TUPLE=	drobilla:autowaf:c87cc53:waflib/waflib
 
 NO_ARCH=	yes
 
 .include <bsd.port.mk>