<Please bear with me; I'm a Raw Linux Newbie.>
I have the same problem installing ISPConfig on a new Gigabyte board with an AMD-64. So how does recompiling zlib affect the rest of the ISP setup? I finally got everything else working after 5 installs, and don't want to demolish anything!
[Don't get me wrong. It was a great learning experience, and I'm very grateful for your extensive instructions in the article. "Hand holding" I called it when I tried to explain it to my wife. "You're holding hands over the Internet with a *guy* named Falko in Germany?" she shrieked. So now I'm sleeping on the couch. But the server works!]