OS X comes with three CD's:
1) OS X
2) OS 9
3) Developers tools for OS X.
The third was a bit of a trip down memory lane, as it is largely filled with similar tools to the developers tools on NeXTSTEP. It's great to have that feeling again, I must say. Even the icon for InterfaceBuilder is the same.
Curiously, though, I can't build openssl/openssh, but, that's a topic for another thread.