{
  lib,
  config,
  inputs,
  system,
  ...
}: let
  inherit (lib) mkIf optionals;
in {
  imports = [
    inputs.preload-ng.nixosModules.default
  ];

  config = mkIf config.desktops.enable {
    # nix-ld
    programs.nix-ld.enable = true;

    # appimage
    programs.appimage = {
      enable = true;
      binfmt = true;
    };

    # flatpak
    services.flatpak.enable = true;

    # services
    services.libinput.enable = true;

    # audio / video
    services.pipewire = {
      enable = true;
      alsa.enable = true;
      pulse.enable = true;
      jack.enable = true;
    };
    hardware.graphics.enable = true;
    users.groups.audio.members = [config.user];
    users.groups.video.members = [config.user];

    # scheduling
    security.rtkit.enable = true;

    # printing
    services.printing.enable = true;
    services.avahi = {
      enable = true;
      nssmdns4 = true;
      openFirewall = true;
    };
    users.groups.lp.members = [config.user];

    # preload-ng
    services.preload-ng = {
      enable = true;
      package = inputs.preload-ng.packages.${system}.preload-ng-src;
    };
  };
}