- Add USES=compiler:gcc-c++11-lib hoping to remove build errors on

FreeBSD-11.

Reported by:	http://beefy9.nyi.freebsd.org/data/111amd64-default/470749/logs/octave-forge-octclip-1.0.8_8.log

math/octave-forge-octclip/Makefile

@@ -18,10 +18,9 @@ OCTSRC=		${DISTNAME}
 
 WRKSRC=	${WRKDIR}/${OCTSRC}/src
 
-.include "${.CURDIR}/../../Mk/bsd.octave.mk"
+USES+=		compiler:gcc-c++11-lib
 
-post-patch:
-	${REINPLACE_CMD} -e s/CC/MKOCTFILE/ -e s/-Wall// -e s/-Wextra// ${WRKSRC}/Makefile
+.include "${.CURDIR}/../../Mk/bsd.octave.mk"
 
 post-build:
 	${RM} ${WRKSRC}/Makefile ${WRKSRC}/configure

math/octave-forge-octclip/files/patch-Makefile

@@ -0,0 +1,15 @@
+--- Makefile.orig	2018-05-24 03:17:31 UTC
++++ Makefile
+@@ -6,10 +6,10 @@ FLAGSCOMW=-Wall -Wextra -Wshadow -Wcast-
+ #Common optimization flags for C and C++
+ FLAGSCOMO=-O2 -funroll-loops -fno-common -fshort-enums
+ #Flags for C
+-CFLAGS=-std=c99 -pedantic $(FLAGSCOMW) -Wconversion -Wmissing-prototypes
++CFLAGS+=-std=c99 -pedantic $(FLAGSCOMW) -Wconversion -Wmissing-prototypes
+ CFLAGS+=-Wstrict-prototypes -Wnested-externs $(FLAGSCOMO)
+ #Flags for C++
+-CXXFLAGS=$(FLAGSCOMW) $(FLAGSCOMO)
++CXXFLAGS+=$(FLAGSCOMW) $(FLAGSCOMO)
+ #Export flags for compilers and linker
+ export CFLAGS CXXFLAGS
+