let 
  nixpkgs = fetchTarball "https://github.com/NixOS/nixpkgs/tarball/nixos-25.11";
  pkgs = import nixpkgs { config = {}; overlays = []; };
in 
{
  hello = pkgs.callPackage ./hello.nix { };
  icat = pkgs.callPackage ./icat.nix { };
}