Those directories are normally writable only by root, so the configuration must
be installed by the superuser.
3.3
42 Chapter 3: Basic X.org Configuration
2. The next possibility is a filename specified by the environment variable
XORGCONFIG. The same directory limitations exist as above. To set this variable,
use one of these lines (according to the shell you??™re using):
$ export XORGCONFIG=filename
% setenv XORGCONFIG filename
3. Next, /etc/X11 is searched, first for xorg.conf-4 and then xorg.conf. The
xorg.conf-4 filename is a holdover from the XFree86 3.x to 4.x transition, when
many users had both versions installed on their systems; if a different configuration
was desired for the 4.x server, it was placed in the -4 configuration file.
4. /etc is next on the list, but only xorg.conf is sought in that directory.
5. /usr/X11R6/etc/X11 is searched. This directory may be a network share, so a
machine-specific configuration file is sought first using the hostname as a suffix
(xorg.conf-hostname). If the hostname isn??™t present, the X server looks for
xorg.conf-4 and then xorg.conf.
6. /usr/X11R6/lib/X11 is searched, using the same filenames as step 5.
When executing the X server as the root user, additional paths are
searched:
??? cmdline is searched before step 1.
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