{ pkgs ? import <nixos-unstable> {} } :
{

  #pkgs = import (builtins.fetchGit {
  #  name = "nixos-25.05";
  #  url = "https://github.com/nixos/nixpkgs";
  #  rev = "11cb3517b3af6af300dd6c055aeda73c9bf52c48";
  #}) {};

  foo = pkgs.mkShell {
    # nativeBuildInputs is usually what you want -- tools you need to run
    nativeBuildInputs = with pkgs.buildPackages; [ 

    ];

    shellHooks = ''
      export NIX_SHELL_XRFORGE=1

      echo "available commands:"
      echo ""
      echo "  # build xrforge.com binary (via default.nix)
      echo "  nix-build
      echo ""
      echo "  # run as docker 
      echo "  docker exec ...
      echo ""
      
    '';
  };


}