Have you installed the X11Update2006 package from Apple?  I think that
fixes this problem.  A copy of it is here:
 

http://surfer.nmr.mgh.harvard.edu/pub/dist/X11Update2006.dmg

Which OS are you using?

From: freesurfer-bounces@nmr.mgh.harvard.edu [mailto:freesurfer-bounces@nmr.mgh.harvard.edu] On Behalf Of Anil Roy
Sent: quinta-feira, 4 de outubro de 2007 22:17
To: freesurfer@nmr.mgh.harvard.edu
Subject: [Freesurfer] TkmEdit message

Hi,

When I run tkmedit, I receive the following message. It doesn't seem to affect the functionality. Could you explain why this message shows up.

Xlib:  extension "XFree86-DRI" missing on display ": 0.0".

Thanks,

Anil.