Index: head/devel/estd/Makefile
===================================================================
--- head/devel/estd/Makefile	(revision 503861)
+++ head/devel/estd/Makefile	(revision 503862)
@@ -1,25 +1,25 @@
 # $FreeBSD$
 
 PORTNAME=	estd
 DISTVERSION=	0.3.2
 CATEGORIES=	devel
 
 MAINTAINER=	yuri@FreeBSD.org
 COMMENT=	Header-only C++ utilities in the style of the standard library
 
 LICENSE=	BSD3CLAUSE
 LICENSE_FILE=	${WRKSRC}/LICENSE
 
-USES=		cmake
+USES=		cmake compiler:c++17-lang
 USE_GITHUB=	yes
 GH_ACCOUNT=	fizyr
 
 NO_ARCH=	yes
 
 do-test:
 	@cd ${BUILD_WRKSRC} && \
 		${SETENV} ${CONFIGURE_ENV} ${CMAKE_BIN} ${CMAKE_ARGS} -DBUILD_TESTS:BOOL=ON ${CMAKE_SOURCE_PATH} && \
 		${SETENV} ${MAKE_ENV} ${MAKE_CMD} ${MAKE_ARGS} ${ALL_TARGET} && \
 		${SETENV} ${MAKE_ENV} ${MAKE_CMD} ${MAKE_ARGS} check
 
 .include <bsd.port.mk>