{ lib, ... }:
{
  # mkFeatureEnableOption =  { suiteEnable, ...} @ attrs :
  #   lib.mkOption (builtins.removeAttrs (lib.mergeAttrs attrs {
  #     default = true;
  #     example = true;
  #     type = lib.types.bool;
  #     apply = old: suiteEnable && old;
  #   }) ["suiteEnable"]);

  # mkDependentFeatureEnableOption =  { suiteEnable, otherOption, ...} @ attrs :
  #   lib.mkOption (builtins.removeAttrs (lib.mergeAttrs attrs {
  #     default = true;
  #     example = true;
  #     type = lib.types.bool;
  #     apply = old: suiteEnable && otherOption && old;
  #   }) ["suiteEnable" "otherOption"]);

  # mkSuiteEnableOption = { suiteDependents, ... } @ attrs :
  #   lib.mkOption lib.mergeAttrs attrs {
  #     default = [];
  #     example = [];
  #     type = lib.types.list;
  #     apply = old: old || lib.lists.any suiteEnabledPred suiteDependents;
  #   };

  mkFeatureEnableOption = { ... } @ attrs :
    lib.mkOption (lib.mergeAttrs attrs {
      default = true;
      example = true;
      type = lib.types.bool;
    });

  mkSuiteEnableOption = { ... } @ attrs :
    lib.mkOption (lib.mergeAttrs attrs {
      default = false;
      example = true;
      type = lib.types.bool;
    });

  trivialFromOrg = { ... } @ attrs : (
    lib.mergeAttrs attrs {
      preBuild = ''
        for file in ./*.org
        do
            emacs --batch --eval "(require 'org)" --eval "(org-babel-tangle-file \"$file\" (concat (file-name-sans-extension \"$file\") \".el\") \"emacs-lisp\")"
        done
        '';
  unpackCmd = ''
    case "$curSrc" in
      *.el)
        # keep original source filename without the hash
        local filename=$(basename "$curSrc")
        filename="''${filename:33}"
        cp $curSrc $filename
        chmod +w $filename
        sourceRoot="."
        ;;
      *.org)
        # keep original source filename without the hash
        local filename=$(basename "$curSrc")
        filename="''${filename:33}"
        cp $curSrc $filename
        chmod +w $filename
        sourceRoot="."
        ;;
      *)
        _defaultUnpack "$curSrc"
        ;;
    esac
  '';
    });
}