Problemas PHP en localhost

[hinfra]

Me da este error... "Fatal error: Call to undefined function _() in C:\wamp\www\www\libs\utils.php on line 24"

Código php:

<?php
// The source code packaged with this file is Free Software, Copyright (C) 2005-2007 by
// Ricardo Galli <gallir at uib dot es>.
// It's licensed under the AFFERO GENERAL PUBLIC LICENSE unless stated otherwise.
// You can get copies of the licenses here:
//      [url]http://www.affero.org/oagpl.html[/url]
// AFFERO GENERAL PUBLIC LICENSE is also included in the file called "COPYING".
 
mb_internal_encoding('UTF-8');
 
// Use proxy detecttion
if ($globals['check_behind_proxy']) {
    require_once(mnminclude.'check_behind_proxy.php');
    $globals['user_ip'] = check_ip_behind_proxy();
} else {
    $globals['user_ip'] = $_SERVER["REMOTE_ADDR"];
}
 
// Warn, we shoud printf "%u" because PHP on 32 bits systems fails with high unsigned numbers
$globals['user_ip_int'] = sprintf("%u", ip2long($globals['user_ip']));
 
$globals['now'] = time();
 
$globals['negative_votes_values'] = Array ( -1 => _('irrelevante'), -2 => _('antigua'), -3 => _('cansina'), -4 => _('amarillista'), -5 => _('spam'), -6 => _('duplicada'), -7 => _('provocación'), -8 => _('errónea'),  -9 => _('copia/plagio'));
 
 
$globals['extra_js'] = Array();
$globals['extra_css'] = Array();
$globals['post_js'] = Array();
 
// For PHP < 5
if ( !function_exists('htmlspecialchars_decode') ) {
    function htmlspecialchars_decode($text) {
        return strtr($text, array_flip(get_html_translation_table(HTML_SPECIALCHARS)));
    }
}
...
y el codigo sigue...
 

Es algo del php.ini seguro... porque todo tendria que funcionar...

AYUDAAAAAAAAAAA