error while loading shared libraries: libssl.so.4:

Let me preface my question by saying that I am relatively new to linux.
I recently installed a program that is failing to run because of the following error.  
 "error while loading shared libraries: libssl.so.4: cannot open shared object file: No such file or directory"
I believe that we are running Fedora Core 6.
I have searched the harddrive and found the following files which I assume are just newer versions of the same file:
./lib/libssl.so.6
./lib/libssl.so.0.9.8b
Would it be ok to create a link from /lib/libssl.so.4 to one of the files listed or would the different file versions cause my program to fail or become unstable?  If it is ok, which file would you link to?
Thanks,
Danny
accessintAsked:
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mglxxxCommented:
Generally speaking, it is not a good idea to make a program which is needing an older version of a shared library work by creating
a link to a newer version. Often the program will crash straight away or fail in certain situations.
If you've got access to the source of the failing program, I'd try rebuilding it using the newer version of the shared
library. Failing that, you try to get hold of the old version of the shared library and install that.
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accessintAuthor Commented:
Unfortunately, it is a proprietary piece of software which we do not have the source for.  When you say, "try to get hold of the old version of the shared library and install that" does that mean that I could simply copying the file libssl.so.4 from a fedora core 4 machine into the same directory as the libssl.so.6? or is it more complicated than that?  
Thanks for your help.
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mglxxxCommented:
Copying over that library from another box might be an option. I'm not sure on what other libs libssl depends. It's certainly worth a try. A quick test would be:
Copy over the lib.
Do an 'ldd your_program_which_needs_libssl.so.4'
If this doesn't report any libs as missing, chances are good that your software will run.
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