{ nixpkgs }:
{
  modules,
  system ? builtins.currentSystem,
  platform ? null,
  crossSystem ? null,
}:

let
  pkgs = import nixpkgs {
    inherit system;
    platform = platform;
    config = { };
  };
  pkgsModule =
    { config, ... }:
    {
      _file = ./default.nix;
      key = ./default.nix;
      config = {
        nixpkgs.pkgs = (
          import nixpkgs {
            inherit system crossSystem;
            config = config.nixpkgs.config;
            overlays = config.nixpkgs.overlays;
          }
        );
        nixpkgs.localSystem =
          {
            inherit system;
          }
          // pkgs.lib.optionalAttrs (crossSystem != null) {
            inherit crossSystem;
          };
      };
    };
  baseModules = [
    ./base.nix
    ./system-path.nix
    ./stage-1.nix
    ./stage-2.nix
    ./runit.nix
    (nixpkgs + "/nixos/modules/system/etc/etc.nix")
    (nixpkgs + "/nixos/modules/system/activation/activation-script.nix")
    (nixpkgs + "/nixos/modules/misc/nixpkgs.nix")
    (nixpkgs + "/nixos/modules/system/boot/kernel.nix")
    (nixpkgs + "/nixos/modules/misc/assertions.nix")
    (nixpkgs + "/nixos/modules/misc/lib.nix")
    (nixpkgs + "/nixos/modules/config/sysctl.nix")
    pkgsModule
  ];
  other = {
    _module.check = true;
    _module.args = { };
  };
in
pkgs.lib.evalModules {
  prefix = [ ];
  modules =
    modules
    ++ baseModules
    ++ [
      pkgsModule
      other
    ];
}