> You also should comment out the line:
> XINC = -nostdinc -I../xinc
> in Makefile.sun3 (as the comment implies)

Oops.  Apparently I didn't read that closely enough.  I did think about
the -nostdinc, though, and didn't think it would be appropriate to
remove it, since since it seems to me that building a kernel ought not
be dependent on the OS you're doing it in.  That would include, for
instance, building a NetBSD-current kernel more recent than the version
of NetBSD installed on the host.  Upon looking closer, though, I see
that my NetBSD/sparc kernel builds don't do -nostdinc.  Hmmm.

Anyway, that'll obviously solve that problem.

Of course, wouldn't

XINC = -nostdinc -I../../../../../include

do the right thing, cross-compiling or not?  That has the disadvantage
of requiring the rest of the source tree just to compile a kernel,
though, and I suppose that would be a real problem to many people.

I think I'll move out of build politics and back into kernel hacking,
now..  :)

- Geoff