Index: head/math/rocs/Makefile
===================================================================
--- head/math/rocs/Makefile	(revision 458570)
+++ head/math/rocs/Makefile	(revision 458571)
@@ -1,19 +1,24 @@
 # $FreeBSD$
 
 PORTNAME=	rocs
 PORTVERSION=	${KDE4_VERSION}
 PORTREVISION=	7
 CATEGORIES=	math kde kde-kde4
 
 MAINTAINER=	kde@FreeBSD.org
 COMMENT=	KDE Graph theory IDE
 
 LIB_DEPENDS=	libboost_thread.so:devel/boost-libs
 
 USES=		cmake:outsource grantlee:4 kde:4 tar:xz
 USE_KDE=	kdelibs automoc4
 USE_QT4=	gui qtestlib script scripttools webkit xml \
 		moc_build qmake_build rcc_build uic_build
 USE_LDCONFIG=	yes
 
+# clang 6.0 defaults to -std=gnu++14, which breaks the build:
+# /wrkdirs/usr/ports/math/rocs/work/rocs-4.14.3/VisualEditor/Actions/SelectMoveHandAction.cpp:86:52: error: no viable conversion from 'int' to 'QPainter::RenderHints' (aka 'QFlags<QPainter::RenderHint>')
+#         _graphScene->views().at(0)->setRenderHints(QPainter::Antialiasing
+USE_CXXSTD=	gnu++98
+
 .include <bsd.port.mk>