diff --git a/graphics/ptex/Makefile b/graphics/ptex/Makefile
index a95bfca94026..187b2c3eb39d 100644
--- a/graphics/ptex/Makefile
+++ b/graphics/ptex/Makefile
@@ -1,44 +1,44 @@
 # $FreeBSD$
 
 PORTNAME=	ptex
 DISTVERSIONPREFIX=	v
 DISTVERSION=	2.3.2
 CATEGORIES?=	graphics
 
 MAINTAINER=	FreeBSD@Shaneware.biz
 COMMENT=	Per face texture library
 
 LICENSE=	BSD3CLAUSE
 
-USES=		cmake:insource pkgconfig
+USES=		cmake:insource compiler:c++11-lang pkgconfig
 USE_LDCONFIG=	yes
 
 USE_GITHUB=	yes
 GH_ACCOUNT=	wdas
 
 # yes really, the release tarbal doesn't know what version it is
 CMAKE_ARGS+=	-DPTEX_VER:STRING=${DISTVERSION}
 
 OPTIONS_DEFINE=		DOCS
 
 DOCS_BUILD_DEPENDS=	doxygen:devel/doxygen
 
 post-build-DOCS-on:
 	@(cd ${WRKSRC}/src/doc && doxygen Doxyfile)
 
 do-install:
 	${INSTALL_LIB} ${BUILD_WRKSRC}/src/ptex/libPtex.so \
 		${STAGEDIR}${PREFIX}/lib
 	${INSTALL_DATA} ${BUILD_WRKSRC}/src/ptex/libPtex.a \
 		${STAGEDIR}${PREFIX}/lib
 	${INSTALL_PROGRAM} ${BUILD_WRKSRC}/src/utils/ptxinfo \
 		${STAGEDIR}${PREFIX}/bin
 	${MKDIR} ${STAGEDIR}/${PREFIX}/include/ptex
 	${INSTALL_DATA} ${BUILD_WRKSRC}/src/ptex/*.h ${STAGEDIR}/${PREFIX}/include/ptex
 
 do-install-DOCS-on:
 	@${MKDIR} ${STAGEDIR}${DOCSDIR}
 	@cd ${BUILD_WRKSRC}/src/doc/ptex/ && \
 		${INSTALL_DATA} * ${STAGEDIR}${DOCSDIR}
 
 .include <bsd.port.mk>