Description:
------------
Ok, I have found a couple of spots mentioning this, including here. But no solid answer.
This code works fine on 2 WinXP boxes, 1 RH linux box, and another misc linux (I think also RH). So I'm thinking this isn't a relative position issue.

However it does not work on a custom Web Server Application box (aka Cobalt RaQ 550).

Reproduce code:
---------------
Here is the senerio:
DOCUMENT_ROOT: /home/.sites/143/site2/web/
SitePath of index.php: /modules/adminpanel/
SitePath of privileges.php: /modules/adminpanel/
SitePath of fleet_functions.php: /includes/
SitePath of fleetdb.php: /includes/

File1: index.php
<?
  $myRoot = $_SERVER['DOCUMENT_ROOT'];
  include("privileges.php");
?>
File2: privileges.php
<?
  include_once("$myRoot/includes/fleet_functions.php");
?>
File3: fleet_functions.php
<?
  include("fleetdb.php");
?>

Expected result:
----------------
I expected all the files to be included like they have on my local box testing and server testing. This is something unique about my new development test server.

Actual result:
--------------
I get an error message on the fleet_functions.php file:

Warning: main(fleetdb.php): failed to open stream: No such file or directory in /home/.sites/143/site2/web/includes/fleet_functions.php on line 2

Warning: main(): Failed opening 'fleetdb.php' for inclusion (include_path='') in /home/.sites/143/site2/web/includes/fleet_functions.php on line 2