Is there an updated guide for cross compilation from Linux to -> RPI, Mac, Windows, Android?

I want to work on my system and not install OF for each platform. I live in Cuba and my connection is very limited and slow, I cannot download OF for so many platforms and their dependencies.

There are many different and outdated unofficial guides here, it causes me confusion.

What is the most optimal way to export from one platform to the others?

Thanks in advance for the help!