Ok. This problem has been resolved by the following solution.
I have recompiled zlib from sources provided
Please note, no --libdir was provided (is that needed?) And afterwards just repeated ISPConfig installation.
P.S. Moderators, please prepend the title of this thread with [Solved]. I think this solution can be useful because such problem occures not only when compiling Clam. I saw messages on different forum that it also happen on PHP compilation for example.
Last edited by FractalizeR; 25th August 2008 at 11:45.