Where is XFree86?

[Lei]

I am a newbie debian and I am trying to make my toshiba 2405-s202 laptop 
 to work with xserer.

I found 
http://lists.debian.org/debian-user/2002/debian-user-200210/msg01878.html

but I can't find where XFree86 executable is, which I would like to run 
XFree86 -configure for auto detection configuration...

Please help

Lei

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