These diffs are only between the libc/PMAX files of the CMU-CS
libc for the pmax and the Ultrix 4.2 files in libc/_mips.d.
Also some of files have merely been renamed and I haven't had
time to diff them yet.

The purpose of these diffs would be to build the CMU bsd style libc
from the machine independent sources in the i386 release and the
mips specific sources from your Ultrix 4.2 sources with these
diffs applied to them. This should result in a libc that the
i386 sources would build with. 

If you want to use Ultrix sources or binaries for your environment
you need to change the Ultrix libc pieces that use syscalls that
Mach does not support. isatty.c is such an example.