Looking for cross C compiler for 8086, PS-DOS, large memory model

[d.e.gillespie]

> I'm looking for a C compiler for the IBM PC, PC-DOS,
> with the following characteristics:
>
>   1)  cross compiler, must run under UNIX
>   2)  supports the huge memory model
>   3)  produce reasonably efficient code

AT&T does have a software generation system (SGS) called Basic-16 which
we use to generate code for an 8086.  I think it has all the characteristics
covered.