Hi.
I reinstalled os x tiger (10.4) on my dual g4 and wrote most of the
steps down required to install rails and postgresql and lighttpd.
The installation is partly based on
Dan Benjamin.
hth
Claus
A link would be nice 
A link would be nice
Dang, I wonder why I ever missed that 
http://cguttesen.blogspot.com/
regards
Claus