"make depend" on the pmax is bombing out because <sys/cdefs.h>
ends up getting included in a .S file.  <sys/cdefs.h> is getting
included because the depend target isn't using AFLAGS, which
contains -D_LOCORE.  So a compile still works, but a "make depend"
doesn't.

What's the right way to fix this?  The depend target uses CFLAGS,
CPPFLAGS and AINC - I'm guessing it should use AFLAGS instead of
CFLAGS...

Simon.