I'm trying to make a mach3 target gcc.  GCC is really pissing me off
by moaning about include files when it tries to invoke xgcc;
apparently it is expecting to find things like machine/ansi.h
which are only in /usr/include, and it apparently isn't
looking there.

Moreover, I had to add thigns like:
#define DONT_DECLARE_SYS_SIGLIST

to xm-netbsd.h, and other things of that nature.
I'm trying to do this for the primary reason that I want it to invoke
i386-mach3-as instead of the regular as for the .code16 macro.

What am I doing wrong?