The closest I could find is libsstrings.so from
sstrings-1.0.4-1.1.fc1.rf RPM for i386

I rename libsstrings.so to libsstring.so
but when I execute the program it complains

undefined symbol: _ZN7sstring4nposE


any ideas?

You should never rename library files. The .so file you're looking for, is probably part of the development libraries, for that particular package.

Since you don't say what version/distro of linux you're using, can't really say what you might need to install to fix it. First thing I'd do, though, is to put that file name back where you found it.

I am running redhat server enterprise 5.3 I have checked all the disks from enterprise 5.3. I don't find any libsstring.so inside.

The package 'sstrings' for RH EL 5, example :
http://rpm.pbone.net/index.php3/stat....i386.rpm.html
( 'sstrings-devel' is available too.)

> > http://rpm.pbone.net/index.php3
> > "Search" > 'Advanced Search' , RedHat EL 5
to get sstrings-2.0.1-1.el5.rf.i386.rpm providing 'libsstrings2...'

If 'libsstrings(1)..' is required, try with the versions for
Fedora 2 or 3 e.g. sstrings-1.0.4-1.1.fc3.rf.i386.rpm

The issue "Needs libsstring.so" must be a bug in your application.
Either fix it, or do # 'ln -s libsstrings2.so.0 libsstring.so'
( Replace libsstrings2.so.0 with preferred version.)
.....
The source code for version 1 is here
http://dries.ulyssis.org/rpm/package...ings/info.html
Please look for 'sstrings-1.0.4-1.1.fc2.rf.src.rpm'
( If you want to compile your own 'libsstrings'.)
.....

As knudfl said, you can find it on pbone (I'd get the sstrings-devel package), or do it through online update from RedHat directly. If you need to download/install it manually, you can contact RedHat support, since you're paying for it with your RedHat Enterprise....

Or add the 'rpmfusion.org' repo, as these packages are marked "rf"

http://rpmfusion.org/Configuration

... or may be the packages are 'rpmforge' ?

https://rpmrepo.org/RPMforge/Using
.....