I sort of suspected that it was Xorg but had no proof until now. I guess that is is Xorg version 11 as the following output shows.
bill@linux:~> Xorg -version
X Window System Version 6.8.1
Release Date: 17 September 2004
X Protocol Version 11, Revision 0, Release 6.8.1
Build Operating System: SuSE Linux [ELF] SuSE
Current Operating System: Linux linux 2.6.8-24-default #1 Wed Oct 6 09:16:23 UTC 2004 i686
Build Date: 04 October 2004
Before reporting problems, check http://wiki.X.Org
to make sure that you have the latest version.
Module Loader present
bill@linux:~> xFree86 -version
bash: xFree86: command not found