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I downloaded the Minix sources and there I saw that cc was called with -mi86 option to generate 8086/286 code.
My gcc version doesn't support this option... only i386 and above (wich generates 32bit code).
Does anyone know how can I make my gcc compiler (3.2) or another one (another gcc version) to support -mi86 option (to generate 16bit code).
I also read in as manual (info as) that gcc can generate 16bit code, but it didn't told how

OK... Thanks...

One of the assumptions of the entire GNU project, and GCC in particular, is that all the world is a 32-bit or wider system.

I do not for an instant believe that GCC can output code for a 286.

GNU as can assemble something that can run in a 16-bit code segment, but I don't remember hearing that it could handle 16-bit addressing modes.

I recommend that you look for another C compiler. Try looking around the ELKS project, if it still exists, they used a 16-bit compiler...