I tried with newnon's cocos2d-x, but in the Spritebuilder-x-Demo i didn't found any proj.android subdirectory.
I copied then proj.android from on older (v 3.10) Project. After edited the Android,mk for sources and includes i could'n compile to android.
Then i decided, maybe i try with the working cocos2d-x (3.10), but no success on android.
Could you please add the proj.android subdirectory to SpriteBuilder-X-Demo?