Index: head/math/cadical/Makefile
===================================================================
--- head/math/cadical/Makefile	(revision 536998)
+++ head/math/cadical/Makefile	(revision 536999)
@@ -1,38 +1,40 @@
 # $FreeBSD$
 
 PORTNAME=	cadical
 DISTVERSION=	1.0.3
 DISTVERSIONSUFFIX=	-cb89cbf
 PORTREVISION=	1
 CATEGORIES=	math devel
 MASTER_SITES=	http://fmv.jku.at/${PORTNAME}/
 
 MAINTAINER=	yuri@FreeBSD.org
 COMMENT=	Simple CDCL satisfiability solver
 
 LICENSE=	MIT
 LICENSE_FILE=	${WRKSRC}/LICENSE
 
+BROKEN_FreeBSD_12_powerpc64=	fails to build: sed: 1: "s,@CXXFLAGS@,-O2 -pipe  ...": bad flag in substitute command: '-'
+
 USES=		compiler:c++0x gmake tar:xz
 GNU_CONFIGURE=	yes
 
 CXXFLAGS+=	-fPIC
 
 MAKEFILE=	makefile
 
 BINARY_ALIAS=	make=${GMAKE}
 
 EXES=		cadical mobical
 
 PLIST_FILES=	${EXES:S/^/bin\//} \
 		include/ccadical.h \
 		lib/libcadical.a
 
 do-install:
 .for e in ${EXES}
 	${INSTALL_PROGRAM} ${WRKSRC}/build/${e} ${STAGEDIR}${PREFIX}/bin
 .endfor
 	${INSTALL_DATA} ${WRKSRC}/src/ccadical.h ${STAGEDIR}${PREFIX}/include
 	${INSTALL_DATA} ${WRKSRC}/build/libcadical.a ${STAGEDIR}${PREFIX}/lib
 
 .include <bsd.port.mk>