{
  description = "System building flake";

  inputs = {
    pkgs.url = "github:NixOS/nixpkgs/nixos-24.11"; 
    pkgs-unstable.url = "github:NixOS/nixpkgs/nixos-unstable";
  };

  outputs = { self, pkgs, pkgs-unstable }: 
  let
    system = "x86_64-linux";
  in {
    nixosConfigurations.nixMain = pkgs.lib.nixosSystem {
      inherit system;
      specialArgs = {
        pkgs-unstable = import pkgs-unstable { inherit system; };
      };
      modules = [ ../configuration.nix ];
    };
  };
}