Gordon Kenyon 0 Posted January 28 (edited) UPDATE - my bad , I had failed to uncheck the references in Deployment Manager under Featured files My app compiles and runs fine in debug configuration - running against a physical android device. The same code when targeting the application store and attempting to compile generates 26 errors starting with the one below, all relating to libibtogo.a MSBUILD : error E2597: E2597 c:\\program files (x86)\\embarcadero\\studio\\23.0\\lib\\Android\\Release/libibtogo.a(eng_init.o):eng_init.c:function engine_unlocked_init: error: undefined reference to '__sync_fetch_and_add_4' I am using iblite not ibtogo and I am not sure where this reference is coming from. I can't see any reference in the release configuration for Android 64-bit platform? Edited January 29 by Gordon Kenyon Resolved issue Share this post Link to post