Some changes to the installed XFree86 directory structure have been
implemented for 4.0.
One important
change is a modified search path for the X
server's XF86Config file. The details of this can be found
in the XF86Config manual page. The other main change is moving
most of the run-time configuration files to /etc/X11, with
symbolic links in the old /usr/X11R6/lib/X11 location pointing
to the new location. Some run-time generated files are now located
under the appropriate subdirectories of /var, again with the
relevant symbolic links in the old location.