[Opensa]: mod_rewrite enable

Hi All,
I need to rewrite the default response to the get request of one file
(I want the response to be a 408 Request Timeout).
After looking on internet I found that I need to use mod_rewrite.
I am using an Opensa version (Apache 1.3.13).
I wrote in the httpd.conf the following lines:
....
ClearModuleList
AddModule mod_rewrite.c
....
LoadModule rewrite_module modules/mod_rewrite.so


Then I started Apache and I get the following error: Cannot add module
via name 'mod_rewrite.c': not in list of loaded modules

Where is the problem?
After this how can I rewrite the server's answer so that it is a 408?
Thank you all in advance

Ciao

Roby