> What is the correct way to (re)build the toolchain? I think the
> following is out of date...

Yah, it might still work, but it's far easier:

in /usr/src do: "./build.sh -t"

And you are done. The toolchain is now integrated, a simple "./build.sh" would
build your sparc64 world including the toolchain (and even if running on 
something much faster != sparc64)

Martin