> httrack: /lib64/libz.so.1: no version information
> available (required by /usr/lib64/libhttrack.so.2)
> Segmentation fault

Apparently this is an issue in some -devel versions of zlib:
<http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=431124>

Can you try to upgrade to the latest zlib version if you built httrack ?