I've managed to get Xmac68k building from the XFree86 4.x code base with
the reachover tools.  Matthew Green was right.  It's a lot easier than it
seems.  Hopefully I'll have the Xmac68k_color server working in a day or
two.

Diff to src
   http://gomerbud.com/daver/patches/netbsd/Xmac68k_src.diff

Diff to xsrc
   http://gomerbud.com/daver/patches/netbsd/Xmac68k_xsrc.diff

Screenshot
   http://gomerbud.com/daver/files/netbsd/Xmac68k_snapshot.png

I didn't bother to hook Xmac68k to the native XFree 4.x build.  It takes
about 20 hours to build X on the Quadra 700 that I have.

-- 
   David P. Reese, Jr.                                  daver at gomerbud.com
                                               http://www.gomerbud.com/daver/