[symlinks, ld.so.conf, RPATH]

  (And what will that do to binary packages 
  built on other machines?)

Currently X isn't recorded as a dependency, probably because it is
part of the base system.  If xorg doesn't provide the same version
shlibs in the same place, this will have to change, or else binary
packages could be labeled 'netbsd+xf864' vs 'netbsd+xorg'.
We may already have this issue with XF86 3 vs 4.

-- 
        Greg Troxel <gdt@ir.bbn.com>