{
  lib,
  config,
  pkgs,
  ...
}:
let
  cfg = config.dependencies;

  packages = {
    curl.default = "curl";
  };

  mkDependencyOption = name: properties: {
    enable = lib.mkEnableOption "Add ${name} to dependencies.";

    package = lib.mkPackageOption pkgs name properties;
  };
in
{
  options.dependencies = lib.mapAttrs mkDependencyOption packages;

  config = {
    extraPackages = lib.pipe cfg [
      builtins.attrValues
      (builtins.filter (p: p.enable))
      (builtins.map (p: p.package))
    ];
  };
}