Oops.

I think at this point I should re-build base.tar.gz and comp.tar.gz.
It turns out that the cdefs.h and param.h I'd managed
to install on the system on which I built the tarballs weren't
the right ones.   (The  cdefs.h problem is due to me changing
toolchains from an a.out toolchain thats support linker warnings,
to an ELF one that didn't, quite.)

Mea Culpa.

Longer-term, if someone can tell me exactly what directives I should
use to emit ELF `.gnu.warning' sections with gcc 2.7.1 and binutils
2.6, that'd be *greatly* appreciated.