--- modules/webm/libvpx/SCsub.orig  2019-03-23 15:10:53 UTC
+++ modules/webm/libvpx/SCsub
@@ -256,7 +256,7 @@ libvpx_sources_arm_neon_gas_apple = [libvpx_dir + file

 env_libvpx = env_modules.Clone()
 env_libvpx.disable_warnings()
-env_libvpx.Append(CPPPATH=[libvpx_dir])
+env_libvpx.Prepend(CPPPATH=[libvpx_dir])

 webm_multithread = env["platform"] != 'javascript'

