The build system for Puppy pre Puppy 4.3 

https://web.archive.org/web/20060430001404/http://www.puppyos.com/puppy-unleashed.htm



Where unleashed can be downloaded:

https://distro.ibiblio.org/puppylinux/puppy-2_%26_3_%26_4/

Puppy Linux history including info on Unleashed-Core

http://puppylinux.com/history.html