Can't find shared libraries

[Stephen.Murphy@aspex.co.uk]

I installed slink using the CD that came with the New Riders
book and seem to have a problem finding shared libraries.

When I try and run wordperfect  I get -

xwp: can't load library 'libXt.so.6'

locate libXt.so.6 produces

/usr/X11R6/lib/libXt.so.6
/usr/X11R6/lib/libXt.so.6.0

I check permissions with ls -l /usr/X11R6/lib/libXt.so.6* and get

lrwxrwxrwx   1 root     root           12 Nov  6 02:33 /usr/X11R6/lib/libXt.so.6 -> libXt.so.6.0
-rw-r--r--   1 root     root       290440 Feb 23  1999 /usr/X11R6/lib/libXt.so.6.0

I know the paths must be in ld.so.conf so I check with less /etc/ld.so.conf
and get

/usr/lib/tkstep
/usr/X11R6/lib/Xaw3d
/usr/X11R6/lib
/usr/lib/libc5-compat
/lib/libc5-compat
/etc/ld.so.conf (END)

The paths are there - I have run ldconfig loads of times.
The only way I can get the system to find the libraries is to
add put paths in the environment variable LD_LIBRARY_PATH or
to put a link in /lib or /usr/lib.
I shouldn't need to if the path is in ld.so.conf should I?