{
  pkgs,
  builder,
  terminal,
  username,
  ...
}: {
  # List packages installed in system profile. To search by name, run:
  # $ nix-env -qaP | grep wget
  environment.systemPackages = with pkgs; [
    python313
  ];

  # Auto upgrade nix package and the daemon service.
  # services.nix-daemon.enable = true;
  # services.karabiner-elements.enable = true;
  # nix.package = pkgs.nix;

  # Necessary for using flakes on this system.
  nix.settings.experimental-features = "nix-command flakes";
  nix.settings.trusted-users = builder.trustedUsers;

  # Create /etc/zshrc that loads the nix-darwin environment.
  programs.zsh.enable = true; # default shell on catalina
  programs.fish.enable = true;

  # $ darwin-rebuild changelog
  system.stateVersion = 5;

  # The platform the configuration will be used on.
  nixpkgs.hostPlatform = "aarch64-darwin";

  users.users.${username} = {
    name = "${username}";
    home = "/Users/${username}";
    shell = pkgs.${terminal.termShell};
  };

  home-manager.users.${username} = import ../../home/macos/home.nix;
}