Adding BusyBox 1.22.1 source code with all Patches included already!

All you need is android NDK 9c or higher (search google)

then enter busybox-1.22.1/ cp android_ndk_dori_config .config

edit .config to mach your NDK patch + NDK toolchain
and do

make

file busybox will be created in the same folder.

There is ONE Ready there! if you need busybox for 4.2.x or higher
use it.