weird error message after gnat installation

["evangeli@cnam.fr" <evangeli@cnam.fr>]

hello,
i just downloaded and installed gnat-gpl-2005 on my system
i made this simple test program
procedure test is begin null; end;
and i got this error message
+===========================GNAT BUG
DETECTED==============================+
| 2005 (20050729) (i686-pc-linux-gnu) Storage_Error stack overflow (or
erroneous memory access)|
| Error detected at system.ads:153:5
   |
| submit bug report by email to report@adacore.com.
   |
| See gnatinfo.txt for full info on procedure for submitting bugs.
   |
| Use a subject line meaningful to you and us to track the bug.
   |
| Include the entire contents of this bug box in the report.
   |
| Include the exact gcc or gnatmake command that you entered.
   |
| Also include sources listed below in gnatchop format
   |
| (concatenated together with no headers between files).
   |
| Use plain ASCII or MIME attachment.
   |
+==========================================================================+
i retried the download and the install but no change.
any idea on how to fix that?
my system is a linux fedora core 5, kernel 2.6.16-1.2096
gnatls -v
   -> GNATLS GPL 2005
gcc -v
   -> gcc version 3.4.5

thanks for any help