Index: head/devel/chromium-gn/Makefile
===================================================================
--- head/devel/chromium-gn/Makefile	(revision 494313)
+++ head/devel/chromium-gn/Makefile	(revision 494314)
@@ -1,26 +1,30 @@
 # $FreeBSD$
 
 CATEGORIES=	devel www
 PKGNAMESUFFIX=	-gn
 
 MAINTAINER=	pizzamig@FreeBSD.org
 COMMENT=	Gn meta build framework
 
 MASTERDIR=	${.CURDIR}/../../www/chromium
 
 BROKEN_powerpc64=	fails to compile: safe_math_clang_gcc_impl.h:132:45: '__builtin_subcb' was not declared in this scope
 
 BUILDTYPE=	Release
 NO_BUILD=	yes
 
 PLIST=	${.CURDIR}/pkg-plist
 PKGMESSAGE=	${.CURDIR}/pkg-message
 DESCR=	${.CURDIR}/pkg-descr
 PLIST_FILES=	bin/gn
 
 GN_ONLY=	yes
 
+post-extract:
+	@${CP} ${WRKSRC}/base/numerics/safe_math_arm_impl.h ${WRKSRC}/tools/gn/base/numerics
+	@${CP} ${WRKSRC}/base/numerics/safe_conversions_arm_impl.h ${WRKSRC}/tools/gn/base/numerics
+
 do-install:
 	${INSTALL_PROGRAM} ${WRKSRC}/out/${BUILDTYPE}/gn ${STAGEDIR}${PREFIX}/bin
 
 .include "${MASTERDIR}/Makefile"