Well, some very interesting results were obtained; sorry about
taking so long to get back, but I've been through the build
cycle about four times now in order to try to confirm my 
suspicions.

A recap : my overclocked 425t was failing mysteriously during 
'make build' with spurious but repeatable errors (compiler 
signals, garbage in intermediate files, etc.)

Building at 25MHz worked fine, confirming Jason's suggestion
that the overclocking was at fault.

Building at 33MHz works fine as long as I remove the 80ns
RAM cards, leaving only the 70ns parts.

As this only cuts me from 40M to 32M, I'm happy with this.
If there's a FAQ somewhere that this belongs in, I think it
should go there 8)

--
Mike Smith  *BSD hack  Unix hardware collector
The question "why are the fundamental laws of nature mathematical"
invites the trivial response "because we define as fundamental those
laws which are mathematical".  Paul Davies, _The_Mind_of_God_