DBUpgrade.php

<?php
function deployer_autoload($name) {
    $libDirs = array(
        './deployer/lib/deployer/',
        './lib/deployer/',
    );

    foreach ($libDirs as $libDir){
        if(strpos($name, '_')>0) {
            $filePath = $libDir . str_replace('_','/',$name).'.php';
            if(file_exists($filePath)) {
                include_once $filePath;
                break;
            }
        } else {
            $filePath = $libDir . $name .'.php';
            if(file_exists($filePath)) {
                include_once $filePath;
                break;
            }
        }
    }
}