And an i386 port dating back to 1989!
Browsable CVS source is on my ‘unix’ site.
Or for anyone who cares, you can download the compressed MACH_CSRG_CD.7z .
I haven’t tried to build it, but I also see SUN2/3 hardware support, lots of bug fixes from NeXT, but no NeXT hardware support. Also the VAX platform is in there as well.
*EDIT as an update from the future, I ended up getting disk images to Mach/386 and using that as a build system I was in fact able to build the Mach 2.5 i386 images!
Read about that adventure in Mach 2.5 Independence day.