Index: head/graphics/fractgen/Makefile
===================================================================
--- head/graphics/fractgen/Makefile	(revision 509940)
+++ head/graphics/fractgen/Makefile	(revision 509941)
@@ -1,20 +1,20 @@
 # Created by: Thomas Dreibholz <dreibh@iem.uni-due.de>
 # $FreeBSD$
 
 PORTNAME=	fractgen
 PORTVERSION=	2.1.7
 CATEGORIES=	graphics
 MASTER_SITES=	https://www.uni-due.de/~be0001/fractalgenerator/download/
 
 MAINTAINER=	dreibh@iem.uni-due.de
 COMMENT=	Fractal Generator
 
 LICENSE=	GPLv3+
 LICENSE_FILE=	${WRKSRC}/COPYING
 
-USES=		tar:xz cmake qt:5
+USES=		compiler:c++11-lang tar:xz cmake qt:5
 USE_QT=		core xml widgets printsupport buildtools_build qmake_build
 
 CMAKE_ARGS+=	-DCMAKE_INSTALL_MANDIR=${PREFIX}/man
 
 .include <bsd.port.mk>