On 7 31, Tim Rightnour wrote:
> This is what we need to document..  what goes where, and why..

  See hier(7).  The portions of that structure (most notably for the current
discussion, the split of the former catch-all function of lib into lib,
libexec, libdata, and share) relevant to /usr/X11 and /usr/pkg (and /usr/local)
should be considered applicable to those subtrees as well.