rxvt-unicode: skip unfree plugins by default

}:

let

  availablePlugins = lib.filterAttrs (_: v: lib.isDerivation v) rxvt-unicode-plugins;

  availablePlugins = lib.filterAttrs (

    _: v: (lib.isDerivation v && (v.meta.license.free or false))

  ) rxvt-unicode-plugins;

  # Transform the string "self" to the plugin itself.

  # It's needed for plugins like bidi who depends on the perl