[ these comments are relevant to compat sunos only ]

   Some of the newer compat modules, like svr4 and linux (others?) use a
   different root for the emulation, like /emul/svr4 or /emul/linux.  Would
   it not make sense to do this for the other modules as well? Not only is
   this good for consistency, but it also avoids some annoyances.  For
   example, with the sunos compat code one currently has to patch the sun
   ld.so to look for libraries in a different location. if instead the root
   was under /emul/sunos there would be no conflict.

the problem is that you've only got 8 characters to work with:
changing `/usr/lib' to `/emul/sunos' would extend the string 3
characters and break the program.  though this is a good idea,
i'm not entirely sure how to do it properly.