I am trying to modify the NDK and generate new experimental release packages with the doc 'android-ndk-r6\docs\DEVELOPMENT.html',but getting the following error after execute script $NDK/build/tools/rebuild-all-prebuilt.sh --toolchain-pkg=:
ERROR: Source directory doesn't support these ARCHs: arm . . . ERROR: Invalid sysroot: /tmp/ndk-Administrator/build/platforms/android-9/arch-arm
Use --sysroot= to indicate a valid one.
so please guide me how to resolve that