For what its worth, I just had to reinstall IBO 4.5B and D7 and faced
the same problem.

I remembered this solution below and it worked. Previously I had it
installed for at least six months until I got a new computer, so it
seems like this is a stable solution.

Rick

>
> I don't know if this is the proper solution, but I renamed the zlib
> unit to zlib_ibo4 and changed all references to zlib to reference
> zkib_ibo4. That way at least if IBO uses a different version of

zlib

> than rtl then you will get the 'correct' version.
>