Believe it or not, i've just had the same prob. When i went into the subdirectory, all if found were files which ended with .so So, i changed the
xorg.conf file to .../libglx.so
and it stopped complaining. Don't have the foggiest if this really solved the problem or just shut the machine up. I still have the problem that my X server wont's start and gives me a can't load "Default font fixed." message. So, i've posted this problem in another thread and am waiting on some brave soul to venture forth.
Hope this helps! Have a great morning!