I had this problem when building on Libranet's Debian
GNU/Linux and Mandrake 8.1.  It only happens after I apt-get
dist-upgrade my system.  When I try to run httrack, I'd get
an error telling me that libssl.so.0 cannot be found.  This
is how to solve it: 

ln -s /usr/lib/libssl.so.0.9.6 /usr/lib/libssl.so.0