Index: head/math/kalgebra/Makefile
===================================================================
--- head/math/kalgebra/Makefile	(revision 488360)
+++ head/math/kalgebra/Makefile	(revision 488361)
@@ -1,25 +1,25 @@
 # $FreeBSD$
 
 PORTNAME=	kalgebra
 DISTVERSION=	${KDE_APPLICATIONS_VERSION}
 CATEGORIES=	math kde kde-applications
 
 MAINTAINER=	kde@FreeBSD.org
 COMMENT=	KDE graph calculator
 
 LIB_DEPENDS=	libAnalitza.so:math/analitza
 BUILD_DEPENDS=	${LOCALBASE}/share/xsl/docbook/html/docbook.xsl:textproc/docbook-xsl \
 		docbook-xml>0:textproc/docbook-xml
 
 CMAKE_ARGS=	-DBUILD_mobile:BOOL=FALSE
-USES=		cmake gettext kde:5 qt:5 tar:xz
+USES=		cmake compiler:c++11-lang gettext kde:5 qt:5 tar:xz
 USE_GL=		glu
 USE_KDE=	auth codecs config configwidgets coreaddons doctools ecm i18n \
 		kio service widgetsaddons xmlgui
 USE_QT=		core dbus declarative gui location network opengl printsupport \
 		svg testlib webchannel webengine widgets xml \
 		buildtools_build qmake_build
 
 OPTIONS_DEFINE=	DOCS
 
 .include <bsd.port.mk>
Index: head/net-im/kopete/Makefile
===================================================================
--- head/net-im/kopete/Makefile	(revision 488360)
+++ head/net-im/kopete/Makefile	(revision 488361)
@@ -1,39 +1,40 @@
 # $FreeBSD$
 
 PORTNAME=	kopete
 PORTVERSION=	${KDE_APPLICATIONS_VERSION}
 CATEGORIES=	net-im kde kde-applications
 
 MAINTAINER=	kde@FreeBSD.org
 COMMENT=	KDE multi-protocol instant messenger
 
 BUILD_DEPENDS=	v4l_compat>0:multimedia/v4l_compat
 LIB_DEPENDS=    libidn.so:dns/libidn \
 		libjasper.so:graphics/jasper \
 		libotr.so:security/libotr \
 		libqca-qt5.so:devel/qca@qt5 \
 		libv4l2.so:multimedia/libv4l
 
-USES=		cmake jpeg kde:5 qt:5 shebangfix tar:xz
+USES=		cmake compiler:c++11-lang jpeg kde:5 qt:5 shebangfix \
+		tar:xz
 USE_GNOME=	libxml2 libxslt
 USE_KDE=	archive auth bookmarks codecs completion config configwidgets \
 		coreaddons crash dbusaddons dnssd ecm emoticons guiaddons i18n \
 		iconthemes itemviews jobwidgets js kcmutils kdelibs4support \
 		khtml kio notifications notifyconfig parts service solid sonnet \
 		texteditor textwidgets unitconversion wallet widgetsaddons \
 		windowsystem xmlgui
 # KDE PIM components
 USE_KDE+=	contacts identitymanagement libkleo pimtextedit
 USE_QT=	        core dbus gui network phonon4 printsupport sql widgets xml \
 		buildtools_build qmake_build
 
 # See #228640: temporary work around to fix the build on Current with ld being lld.
 LLD_UNSAFE=	yes
 
 SHEBANG_FILES=	protocols/winpopup/winpopup-install \
 		protocols/winpopup/winpopup-send \
 		kopete/kconf_update/*.pl
 
 OPTIONS_DEFINE=	DOCS
 
 .include <bsd.port.mk>
Index: head/security/kgpg/Makefile
===================================================================
--- head/security/kgpg/Makefile	(revision 488360)
+++ head/security/kgpg/Makefile	(revision 488361)
@@ -1,23 +1,24 @@
 # $FreeBSD$
 
 PORTNAME=	kgpg
 DISTVERSION=	${KDE_APPLICATIONS_VERSION}
 CATEGORIES=	security kde kde-applications
 
 MAINTAINER=	kde@FreeBSD.org
 COMMENT=	Encryption tool for KDE
 
 RUN_DEPENDS=	gpg2:security/gnupg
 
-USES=		cmake gettext kde:5 qt:5 tar:xz
+USES=		cmake compiler:c++11-lang gettext kde:5 qt:5 \
+		tar:xz
 USE_KDE=	akonadi akonadicontacts archive auth bookmarks codecs \
 		completion config configwidgets contacts coreaddons crash \
 		dbusaddons doctools ecm i18n iconthemes itemmodels itemviews \
 		jobwidgets kio notifications service solid sonnet textwidgets \
 		widgetsaddons windowsystem xmlgui
 USE_QT=		core dbus gui network printsupport widgets xml \
 		buildtools_build qmake_build
 
 OPTIONS_DEFINE=	DOCS
 
 .include <bsd.port.mk>
Index: head/x11-fm/konqueror/Makefile
===================================================================
--- head/x11-fm/konqueror/Makefile	(revision 488360)
+++ head/x11-fm/konqueror/Makefile	(revision 488361)
@@ -1,25 +1,26 @@
 # $FreeBSD$
 
 PORTNAME=	konqueror
 DISTVERSION=	${KDE_APPLICATIONS_VERSION}
 CATEGORIES=	x11-fm www kde kde-applications
 
 MAINTAINER=	kde@FreeBSD.org
 COMMENT=	KDE system log application
 
 LIB_DEPENDS=	libtidy.so:www/tidy-lib
 
-USES=		cmake desktop-file-utils gettext kde:5 pkgconfig qt:5 tar:xz
+USES=		cmake compiler:c++11-lang desktop-file-utils gettext \
+		kde:5 pkgconfig qt:5 tar:xz
 USE_KDE=	activities  archive auth bookmarks codecs completion config configwidgets \
 		coreaddons crash dbusaddons guiaddons i18n iconthemes \
 		itemviews jobwidgets js kcmutils kdelibs4support \
 		kdesu khtml kio notifications parts pty service solid sonnet \
 		textwidgets unitconversion widgetsaddons windowsystem xmlgui
 USE_QT=		core dbus declarative gui location network printsupport script \
 		speech webchannel webengine widgets x11extras xml \
 		buildtools_build qmake_build
 USE_XORG=	ice sm x11 xext
 
 OPTIONS_DEFINE=	DOCS
 
 .include <bsd.port.mk>
Index: head/x11-toolkits/qt5-uiplugin/Makefile
===================================================================
--- head/x11-toolkits/qt5-uiplugin/Makefile	(revision 488360)
+++ head/x11-toolkits/qt5-uiplugin/Makefile	(revision 488361)
@@ -1,17 +1,17 @@
 # $FreeBSD$
 
 PORTNAME=	uiplugin
 DISTVERSION=	${QT5_VERSION}
 CATEGORIES=	x11-toolkits devel
 PKGNAMEPREFIX=	qt5-
 
 MAINTAINER=	kde@FreeBSD.org
 COMMENT=	Custom Qt widget plugin interface for Qt Designer
 
-USES=		qmake qt-dist:5,tools
+USES=		compiler:c++17-lang qmake qt-dist:5,tools
 USE_QT=		core gui widgets
 
 BUILD_WRKSRC=   ${WRKSRC}/src/designer/src/${PORTNAME}
 INSTALL_WRKSRC= ${WRKSRC}/src/designer/src/${PORTNAME}
 
 .include <bsd.port.mk>