{ pkgs, ... }: {
  nixpkgs.overlays = [
    (self: super: {
      tibia = super.tibia.overrideAttrs (old: {
	src = builtins.path { path = "/home/sasza/Gry/tibia.x64.tar.gz"; name = "tibia.tar.gz"; };
      });
    })
  ];
  # paczki
  environment.systemPackages = with pkgs; [
    tibia

  ];
}