You’ll need to set the Application.mk to whatever platform you used.
https://github.com/tgraupmann/UnrealEngine/blob/4.7-OUYA/Engine/Build/Android/Java/jni/Application.mk
You put the Android-NDK in your path and run ndk-build on the command-line from:
https://github.com/tgraupmann/UnrealEngine/tree/4.7-OUYA/Engine/Build/Android/Java