how to check linked libarys?

[Yapo]

Hello!

I have created configure.in that tests if libary libz.so exists with
AC_CHECK_FILE (i don't want to search with funcion in AC_CHECK_LIB), then if
it is found it also tests libz.so.1.2.3. Now I want to know if libary
libz.so actualy points at libz.so.1.2.3 since there can be more version in
the same dir. I tried with "test file1 - ef file2";  but i can't make it
work or I don't know to write the correct syntax (I am new user of gnu
autoconf).  I would also like to know if there is any predefined macro or
any exemple on the net of how to get or test libary version.

thank you for any helpful reply!
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