Building Haiku from within Haiku...

I just built a recent revision of Haiku in Ubuntu and installed it onto a second disk drive on Athlonica via the the Haiku CD I created. It has WebPositive already installed (part of the .iso CD image I created), so I'd like to keep it the way it is.

But since this is not one of the nightly images, it doesn't have the build tools I need.

Can anyone tell me exactly what I need to do (or where to go), to get the build tools I need to install in my copy of Haiku, so I can start building Haiku from within Haiku?

I'd be greatly appreciative.