Index: head/sysutils/daggy/Makefile
===================================================================
--- head/sysutils/daggy/Makefile	(revision 504997)
+++ head/sysutils/daggy/Makefile	(revision 504998)
@@ -1,26 +1,26 @@
 # $FreeBSD$
 
 PORTNAME=	daggy
 DISTVERSION=	1.1.2
 CATEGORIES=	sysutils
 
 MAINTAINER=	yuri@FreeBSD.org
 COMMENT=	Data Aggregation Utility: runs commands on remote hosts simultaneously
 
 LICENSE=	MIT
 LICENSE_FILE=	${WRKSRC}/COPYING
 
 LIB_DEPENDS=	libbotan-2.so:security/botan2 \
 		libyaml-cpp.so:devel/yaml-cpp
 
-USES=		gl pkgconfig qmake qt:5
+USES=		compiler:c++17-lang gl pkgconfig qmake qt:5
 USE_GITHUB=	yes
 GH_ACCOUNT=	synacker
 USE_QT=		core gui network buildtools_build
 USE_GL=		gl
 
 QMAKE_ARGS=	VERSION="${PORTVERSION}" BUILD_NUMBER="0"
 
 PLIST_FILES=	bin/daggy
 
 .include <bsd.port.mk>