Fix build on non-x86 architectures by conditionally turning off

-march=native.

Approved by:	portmgr (tier-2 blanket)

graphics/opengv/Makefile

@@ -26,4 +26,11 @@ do-test:
 		${SETENV} ${MAKE_ENV} ${MAKE_CMD} ${MAKE_ARGS} ${ALL_TARGET} && \
 		${SETENV} ${MAKE_ENV} ${MAKE_CMD} ${MAKE_ARGS} test
 
-.include <bsd.port.mk>
+.include <bsd.port.pre.mk>
+
+# disable march-native on non-x86 archs
+.if ${ARCH} != amd64 && ${ARCH} != i386
+EXTRA_PATCHES+=	${PATCHDIR}/extra-patch-CMakeLists.txt
+.endif
+
+.include <bsd.port.post.mk>

graphics/opengv/files/extra-patch-CMakeLists.txt

@@ -0,0 +1,11 @@
+--- CMakeLists.txt.orig	2018-10-25 03:22:02 UTC
++++ CMakeLists.txt
+@@ -35,8 +35,6 @@ ELSE()
+   ELSEIF (CMAKE_SYSTEM_PROCESSOR MATCHES 
+           "(arm)|(ARM)|(armhf)|(ARMHF)|(armel)|(ARMEL)")
+     add_definitions (-march=armv7-a)
+-  ELSE ()
+-    add_definitions (-march=native) #TODO use correct c++11 def once everybody has moved to gcc 4.7 # for now I even removed std=gnu++0x
+   ENDIF()
+   add_definitions (
+     -O3