I am trying to put the nusoap library into the vendors area (cake 1.2 rc2)

so i have vendors/nusoap/lib/...
              vendors/nusoap/samples/client1.php

in client1.php, i have require_once('../lib/nusoap.php');

However, this returns an error (cannot find the file nusoap.php in the lib
folder.

This is how to fix it (I think)
require_once('APP\vendors\nusoap\lib\nusoap.php');
Why wouldn't require_once('../lib/nusoap.php') work?

thanks