join_collapse_limit, from_collapse_limit options missing

Hi, I'm trying to set these two options to tune performance but both
return 'not a valid option name'. Dumping the pg_settings table confirms
that they are missing. I'm using the PostgreSQL packages included with
RedHat 9 (7.3.2) and Mandrake 9.2 Beta (7.3.4). Do I need to install the
full tarball to get these options? Any help greatly appreciated.

Thanks, Lee