Index: build_tools/cflags.xml
--- build_tools/cflags.xml.orig
+++ build_tools/cflags.xml
@@ -125,7 +125,7 @@
 		</member>
 		<member name="BUILD_NATIVE" displayname="Allow compiler to generate code optimized for the CPU on which the build is performed.">
 			<support_level>core</support_level>
-			<defaultenabled>yes</defaultenabled>
+			<defaultenabled>no</defaultenabled>
 			<depend>native_arch</depend>
 		</member>
 	</category>