.htaccess authorization on referer

[<charles@lunarmedia.net>]

i'm working on getting a .htaccess file to authenticate based on a referer 
url. i have:

<Limit GET>                                                                
  order deny,allow                                                              
  deny from all                                                                 
    referer allow from http://yourdomain.com/*                                  
    OnDeny http://yourdomain.com/warningpage.htm                                
</Limit> 

i'm getting the following error when i try using this syntax for auth:

  Invalid command 'referer', perhaps mis-spelled or defined by a module 
  not included in the server configuration

is my syntax incorrect? or does it rely on a module? and if so does anyone 
know which so i can verify its in my config?

thanks -charles


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