The configuration and compilation process seems completely standard for YDL 4.0 (or at least the same as what works on RH 9 wth a 2.6.8.1 kernel), untill you get to
make install
The Makefile for YDL 4.0 has removed this entirely instead of modifing it for yaboot. Except of course that make help still shows it, the README still talks about it.
So what gives?