error while loading shared libraries: libX11.so.6

[andy at neu.net]

I recently upgraded to 6.1 beta3, and am now having a problem with
Realplayer.  When I try to start it from the command line, I get the
following:

# realplay
/usr/X11R6/lib/RealPlayer/realplay.bin: error while loading shared
libraries: libX11.so.6: cannot open shared object file: No such file or
directory


I googled, but there does not seem to be a fix.  Any suggestions for
fixing are appreciated.


TIA