Index: head/graphics/katarakt/Makefile
===================================================================
--- head/graphics/katarakt/Makefile	(revision 541731)
+++ head/graphics/katarakt/Makefile	(revision 541732)
@@ -1,35 +1,35 @@
 # Created by: Kurt Kanzenbach <kurt@kmk-computers.de>
 # $FreeBSD$
 
 PORTNAME=	katarakt
 PORTVERSION=	0.2
 CATEGORIES=	graphics
 
 MAINTAINER=	kurt@kmk-computers.de
 COMMENT=	Simple PDF viewer uses as much available screen space as possible
 
 LICENSE=	BSD2CLAUSE
 LICENSE_FILE=	${WRKSRC}/LICENSE
 
 BUILD_DEPENDS=	a2x:textproc/asciidoc
 LIB_DEPENDS=	libpoppler-qt5.so:graphics/poppler-qt5
 
-USES=		qmake pkgconfig qt:5 gl
+USES=		compiler:c++11-lang gl pkgconfig qmake qt:5
 USE_QT=		buildtools_build core gui xml dbus network widgets
 USE_GL=		gl
 
 USE_GITLAB=	yes
 GL_SITE=	https://gitlab.cs.fau.de
 GL_ACCOUNT=	Qui_Sum
 GL_COMMIT=	99735bc0b15b57d689b6c982d43b85ed1b40ef45
 
 PLIST_FILES=	bin/katarakt \
 		man/man1/katarakt.1.gz
 
 post-build:
 	cd ${WRKSRC} && ${MAKE} doc
 
 post-install:
 	${INSTALL_MAN} ${WRKSRC}/doc/katarakt.1 ${STAGEDIR}${MANPREFIX}/man/man1
 
 .include <bsd.port.mk>