- 
Download Boost and cd to base directory. 
- 
Create Android toolchains for desired architectures by running a script as below: NDK=/opt/android-sdk/ndk-bundle/ TOOLCHAINS="$PWD/toolchains/"
rm -rf $TOOLCHAINS
If you need a small makefile introduction/reference you can take a look at my notes https://www.mauriciopoppe.com/notes/os/bin/make/
Project structure
. project
├── Makefile
├── build