I use the following command to set my LD_LIBRARY_PATH in csh:

setenv LD_LIBRARY_PATH=${LD_LIBRARY_PATH}:/home/mydir

but when look at the result, there will always be a "=" symbol at the end of my LD_LIBRARY_PATH even though I didn't type that in.
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The csh setenv syntax is
  setenv <variable> <value>
with no '=' in between.  Therefore, the proper way of doing this is
  setenv LD_LIBRARY_PATH "${LD_LIBRARY_PATH}:/home/mydir"

The version of csh I tested on will actually complain if you try the syntax you gave.  BTW, it will also complain that LD_LIBRARY_PATH is not set in the line I gave and not set the variable, but I believe that is configurable.

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Unix OS

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