{
  inputs = {
    nixpkgs.url = "github:NixOS/nixpkgs/nixos-24.11";
    fiss.url = "git+https://src.mfgames.com/fiss/fiss.git";
  };

  outputs = { self, nixpkgs, fiss, ...}:
  {
    // ...
    environment.systemPackages = with pkgs; [
      fiss.packages.${pkgs.system}.default
    ];
  }