nix/hosts/nixos-laptop/flake.nix

{ 
  # INFORMATION
  # When building for a system, remember to change the hostname variable below
  description = "nixos-laptop flake";

  inputs = {
    # Hardware support
    nixos-hardware.url = "github:NixOS/nixos-hardware/master";
  };

  outputs = { nixos-hardware, ... }@inputs: {
    # NixOS Configuration files:
    nixosConfigurations = {
      # Declare a generic configuration using the $hostname variable:
      ${hostname} =  unstable-nixpkgs.lib.nixosSystem { 
        inherit system;
        specialArgs = { 
          inherit hostname;
        };
        modules = [
          # Configuration Imports
          ./nixos/configuration.nix
          # Flake Imports
          nixos-hardware.nixosModules.lenovo-thinkpad-p1
        ]; # modules
      }; # lib.nixosSystem - ${hostname}
    }; # nixosConfiguration
  };
}