Using the Android Build System for Non-Android Builds

[Aristo]

Hola,

I have been trying to understand the Android build system on a deeper
level as to uses outside of building the platform.

I may not be thinking right, or maybe there is a possibility, but can
I introduce a project of my own to use the Android build system/

* Can i introduce open source code which have autogen/Makefile.am as
it is into the Android.mk ?
* Is there any easy process to figure out what set of src files need
to be mentioned in the Android.mk, inorder to generate the library or
executables?

Foremost, was the Android build system built ONLY for Android platform
or for general usage too? :)

Thanks