ncl: error while loading shared libraries: libnc-dap.so.3

I know you have answered this before but I have tried everything I can
find on your site and I'm still having an error. I am using
ncl_ncarg-5.1.1.Linux_x86_64_gcc412.tar on RHEL5. I have 2 machines
working fine and one with the error in the subject.
I don't have opendap loaded on any of the machines, even the ones
working. My environment variables for LD_LIBRARY_PATH and the output of
ldd $NCARG_ROOT/bin/ncl are the same on all the machines see below:

libX11.so.6 => /usr/lib64/libX11.so.6 (0x00000036b7e00000)
        libXext.so.6 => /usr/lib64/libXext.so.6 (0x00000036b8200000)
        libm.so.6 => /lib64/libm.so.6 (0x00000036b5a00000)
        libdl.so.2 => /lib64/libdl.so.2 (0x00000036b5e00000)
        libstdc++.so.6 => /usr/lib64/libstdc++.so.6 (0x00000036c6c00000)
        libgcc_s.so.1 => /lib64/libgcc_s.so.1 (0x00000036c1c00000)
        libc.so.6 => /lib64/libc.so.6 (0x00000036b5600000)
        libXau.so.6 => /usr/lib64/libXau.so.6 (0x00000036b7600000)
        libXdmcp.so.6 => /usr/lib64/libXdmcp.so.6 (0x00000036b7a00000)
        /lib64/ld-linux-x86-64.so.2 (0x00000036b4600000

  The ncargex cpex08 test works on all the machines but ng4ex gsun01n
generates the above error as does a simple ncl command. I KNOW it has
to be something silly but I have checked rpm's, paths, libraries and
can't seem to find why one machine isn't working. Any ideas? Thanks!
Sarah

-- 
Sarah Thompson
Systems Administrator
Earth System Research Laboratory
Global Systems Division
(303) 497-6024
Sarah.E.Thompson_at_noaa.gov
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