@nubechecorre
As derfs mentioned, you may want to use my docker images. But if you don't, you might find some useful information in the scripts at the following links. Those are used with the Ubuntu set up in the docker images mentioned above. In theory (which means that I haven't tried it) they could be used on any linux system as they are.
https://github.com/walkero-gr/AmigaGCC ... /main/ppc-amigaos/scriptsThe most challenging process though would be to compile the gcc for your system. You can have a look at
https://github.com/AmigaLabs/adtoolsThe docker images have everything included, and they are ready to be used.
A few years ago I did a presentation, which you can see at
https://www.youtube.com/watch?v=WMmlEGXn00AAlso, Hans has created a few excellent videos for cross compiling at
https://www.youtube.com/results?search_query=kea+sigma+amiga