Example overlay for cataclysm-dda that patches the game, adds the one predefined mod and adds a custom mod.

Working as of nixpkgs rev 693bc46.

Test build

./build.sh

NixOS flake

To include it in your flake, copy overlays/ into your flake folder and call the package like this:

overlays = [
  (final: prev: {
    cataclysm-dda = prev.callPackage ./overlays/cataclysm-dda {};
  })
];

Note that the desktop item is probably going to point to the wrong executable, so I'd suggest copying or declaring ~/.local/share/applications/org.cataclysmdda.CataclysmDDA.desktop with just cataclysm-tiles in the Exec= field.