this is mine
[rou@ap4 ~]$ ls -l /usr/X11R6/lib/libXext*
-rw-r--r-- 1 root root 80652 Jun 3 06:36 /usr/X11R6/lib/libXext.a
lrwxrwxrwx 1 root root 14 Jul 27 22:20 /usr/X11R6/lib/libXext.so -> libXext.so.6.4
lrwxrwxrwx 1 root root 14 Jul 27 22:20 /usr/X11R6/lib/libXext.so.6 -> libXext.so.6.4
-rwxr-xr-x 1 root root 61476 Jun 3 06:37 /usr/X11R6/lib/libXext.so.6.4
i not understand why urs one shown the @ mark there
btw i have this suggestion ... u try to update xlibs core library file
use yum update xorg-x11.i386 , if still cannot follow the line below
http://xlibs.freedesktop.org/release...-6.4.3.tar.bz2
after that run /sbin/ldconfig
u can wait other ppl comment or try at your own risk but for me sometime take the risk