Build fails for me under Linux

My SDK Version: 26.1.1, NDK Version: 18.1.5063045
I have an error:

`arm-linux-androideabi-gcc: Command not found`

I need to build for `android-25` platform and seems it contains only `llvm`. Any chance to update this nice script for Linux and latest SKDs? Does it build for `arm64-v8a` as well? Thanks!