How to use waf of ardupilot4.0 to cite third-party packages?

Hello, I want to use other compiled link libraries in ardupilot. Where should I add the code. For example, I want to import the library in my_lib in the same directory as the ardupilot folder in the picture through waf.

There is documentation about that in the developer wiki

Hello, can you please provide a website address? I searched for it and didn’t find it.

The closest I could find in three minutes was: Porting to a new flight controller board — Dev documentation

It’s a good starting point, could not find the other one, sorry.