and why not this as well?

git-svn-id: file:///svn/phpbb/trunk@8965 89ea8834-ac86-4346-8a33-228a782c2dd0

phpBB/includes/captcha/plugins/phpbb_captcha_gd_wave_plugin.php

@@ -0,0 +1,59 @@
+<?php
+/**
+*
+* @package VC
+* @version $Id$
+* @copyright (c) 2006 2008 phpBB Group
+* @license http://opensource.org/licenses/gpl-license.php GNU Public License
+*
+*/
+/**
+* @ignore
+*/
+if (!defined('IN_PHPBB'))
+{
+	exit;
+}
+
+/**
+* Placeholder for autoload
+*/
+include_once(PHPBB_ROOT_PATH . 'includes/captcha/plugins/captcha_abstract.' . PHP_EXT);
+
+class phpbb_captcha_gd_wave extends phpbb_default_captcha implements phpbb_captcha_plugin
+{
+
+	function __construct()
+	{
+		include_once(PHPBB_ROOT_PATH . 'includes/captcha/captcha_gd_wave.' . PHP_EXT);
+	}
+
+	public static function get_instance()
+	{
+		return new phpbb_captcha_gd_wave();
+	}
+
+	static function is_available()
+	{
+		return (@extension_loaded('gd') || can_load_dll('gd'));
+	}
+
+	static function get_name()
+	{
+		return 'CAPTCHA_GD_WAVE';
+	}
+
+	static function get_class_name()
+	{
+		return 'phpbb_captcha_gd_wave';
+	}
+
+	function acp_page($id, &$module)
+	{
+		global $config, $db, $template, $user;
+		
+		trigger_error($user->lang['CAPTCHA_NO_OPTIONS'] . adm_back_link($module->u_action));
+	}
+}
+
+?>