Let's say I have a sloww overloaded 68030 machine, and a blindingly fast 68040
machine.  Say further that the 68040 runs a system built with '040 instructions

How would I, on the '040 system, build a source tree with '030 instructions,
which links everything with the '030 libraries?  I'm assuming there's an
obvious procedure here.

More generally, how does one go about doing the equivalent of "make build"
when the goal is to produce a source tree suitable for running "make
install" on a system which is not fast enough to build?  Is there a
canonical method?

-s