Index: trunk/admin/install/prerequisit_errors.php
===================================================================
diff -u -r1990 -r2536
--- trunk/admin/install/prerequisit_errors.php	(.../prerequisit_errors.php)	(revision 1990)
+++ trunk/admin/install/prerequisit_errors.php	(.../prerequisit_errors.php)	(revision 2536)
@@ -3,7 +3,7 @@
 define('THIS_FILE', 'admin/install/prerequisit_errors.php');
 
 $pathtoroot = "";
-if(!strlen($pathtoroot))
+if( !(isset($pathtoroot) && $pathtoroot) )
 {
   //$path=dirname(realpath(__FILE__));PATH_TRANSLATED
   $path=dirname(realpath(__FILE__));
@@ -47,7 +47,7 @@
 	  $p = "";
       }
     }
-    if(!strlen($pathtoroot))
+    if( !(isset($pathtoroot) && $pathtoroot) )
       $pathtoroot = ".".$pathchar;
   }
   else