After some longer break, I have fetched the current sources and built. I encountered two problems, one is this:

I need to revert the change

to make the al_physfs addon compile with my, admittedly slightly outdated, version of PhysFS. For some reason I can't easily upgrade to use a more recent version of that library, and that commit seems to assume that the PhysFS version is some more recent version.

Any better possibility to fix this, than having to revert this change locally?