{
   inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
   outputs = { self, nixpkgs }: {
      nixosConfigurations.iso = nixpkgs.lib.nixosSystem {
	 system = "x86_64-linux";
	 modules = [
	    "${nixpkgs}/nixos/modules/installer/cd-dvd/installation-cd-minimal.nix"
	 ];
      };
   };
}