Here is the source path for PhysicsFS library, to compile it for MiNT.
No patch for version 3.3.0. I created a fork with appropriate branches on https://github.com/pmandin/physfs.
Branch m68k-atari-mint: Only changes for Atari support.
Branch re3-rofs: Only changes for Resident Evil 3 PC rofs.dat archives.
You can use git cherry-pick if you want to combine the two branches in a third one, see git documentation if needed.
The archive is a series of patches to be applied to current development branch (or version 2.0.3).
This is a source patch for the PhysicsFS library. It allows access to Resident Evil 3 PC rofs.dat archives. Decompression is not supported in this version. Patch must be applied to one of current versions of the library.