html/modules/altsys/admin/index.php
<?php
require '../../../mainfile.php' ;
if (! defined('XOOPS_TRUST_PATH')) {
die('set XOOPS_TRUST_PATH in mainfile.php') ;
}
$mydirname = basename(dirname(__DIR__)) ;
$mydirpath = dirname(__DIR__) ;
// require $mydirpath.'/mytrustdirname.php' ; // set $mytrustdirname
$mytrustdirname = 'altsys' ;
require XOOPS_TRUST_PATH.'/libs/'.$mytrustdirname.'/index.php' ;