Index: devel/chromium-gn/Makefile
===================================================================
--- devel/chromium-gn/Makefile	(revision 492049)
+++ devel/chromium-gn/Makefile	(working copy)
@@ -20,6 +20,10 @@
 
 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