{
  configuration,
  system,
  sources ? import ../npins,
}:
let
  eval = import "${sources.nixpkgs}/nixos/lib/eval-config.nix" {
    inherit system;
    specialArgs = {
      inherit sources;
    };
    modules = [ configuration ];
  };
  toplevel =
    {
      inherit (eval) pkgs config options;
      system = eval.config.system.build.toplevel;
      inherit (eval.config.system.build) vm vmWithBootLoader;
    }
    .config.system.build.toplevel;
in
{
  drv_path = toplevel.drvPath;
  out_path = toplevel;
}