{ ... }:
final: prev: {
  openttd-jgrpp = prev.openttd-jgrpp.overrideAttrs (old: rec {
    version = "0.55.3";
    src = prev.fetchFromGitHub rec {
      owner = "JGRennison";
      repo = "OpenTTD-patches";
      rev = "jgrpp-${version}";
      hash = "sha256-xpo4E07ifWUZy5z78Fwm1SpLP3wUBaBreZYbJuiNH3w=";
    };
  });
}