{ 

  # INFORMATION
  # When building for a system, remember to change the hostname variable below

  description = "NixOS System Config";

  inputs = {
    # NixOS packages
    nixpkgs.url = "nixpkgs/nixos-23.05";

    # Manage dotfiles in a home directory
    home-manager.url = "github:nix-community/home-manager/release-23.05";
    home-manager.inputs.nixpkgs.follows = "nixpkgs";

    # Secureboot Configuration
    lanzaboote.url = "github:nix-community/lanzaboote";
    lanzaboote.inputs.nixpkgs.follows = "nixpkgs";

    # Firefox Overlay
    moz_overlay.url = "github:mozilla/nixpkgs-mozilla";

    # Nix User Repository
    nur.url = "github:nix-community/NUR";
  };

  outputs = { nixpkgs, home-manager, lanzaboote, moz_overlay, nur, ... }@inputs:
  let
    # Variables - Remember to set these
    hostname = "nixos-laptop";
    system = "x86_64-linux";

    pkgs = import nixpkgs {
      # Tells Flake what OS version we are using
      inherit system;
      config = { allowUnfree = true; };
    };
    lib = nixpkgs.lib;
  in {
    # NixOS Configuration files:
    nixosConfigurations = {
      # Declare a generic configuration using the $hostname variable:
      ${hostname} = lib.nixosSystem { 
        inherit system;
        modules = [
          # Hardware Configuration
          ./hosts/${hostname}/hardware-configuration.nix

          # Extra options for the host hardware configuration
          ./hosts/${hostname}/configuration.nix

          # Common NixOS Configuration file
          ./configuration.nix

          # SecureBoot Configuration
          lanzaboote.nixosModules.lanzaboote

          # Import NUR
          nur.nixosModules.nur

          # Tell home-manager to use both global and user packages:
          home-manager.nixosModules.home-manager {
            home-manager.useGlobalPkgs = true;
            home-manager.useUserPackages = true;
            home-manager.users.albert = import ./users/albert/home.nix;
            home-manager.users.root = import ./users/root/home.nix;
            # nixpkgs overlays
            nixpkgs.overlays = [
              moz_overlay.overlay
              nur.overlay
            ];
          }
        ]; # modules
      }; # lib.nixosSystem - ${hostname}
    }; # nixosConfiguration
  };
}