Notable changes that this causes:

* A GNU-style /usr/libexec is now allowed.

Notable non-changes:

* /usr/games, /usr/share/games and /usr/lib/games were optional in
  FHS 2.3, and are still optional. It is up to us whether we want
  to keep using those directories.

Drop our special exception for /run, and replace it with a requirement
that /var/run and /var/lock are symlinks to /run and /run/lock
respectively. The FHS does not mandate that these directories are
symlinked or bind-mounted (although I think it should) and some
misguided distributions make /run and /var/run non-equivalent, but they
have always been equivalent on Debian.

Drop our special exception for /sys, which is now standardized in the
FHS.

Relax the requirement to create /usr/local/share/color to a
recommendation to avoid making 6 packages immediately noncompliant.

Add a special exception for /usr/bin/mh/ for now, restoring the FHS
2.3 situation (dropping this might be a good idea, but should be
disussed with the nmh and mailutils-mh maintainers if desired).

Signed-off-by: Simon McVittie <smcv@debian.org>
Closes: #787816

Signed-off-by: Simon McVittie <smcv@debian.org>

Signed-off-by: Simon McVittie <smcv@debian.org>

Niels wrote the original patch.

See discussion in #880920.

Reported-by: Paul Gevers <elbrus@debian.org>
Suggested-by: Simon McVittie <smcv@debian.org>

    Wording: Ian Jackson <ijackson@chiark.greenend.org.uk>
    Seconded: Sean Whitton <spwhitton@spwhitton.name>
    Seconded: Holger Levsen <holger@layer-acht.org>
    Closes: #901160

Thanks Niels Thykier and Jens Reyer.

The definition says when it must be used.

Policy calls "unofficial targets" "additional targets"

In this section, support for the Rules-Requires-Root field, and support
for values of that field, are both under discussion.  Be more explicit
when referring to these distinct things, for readability.

Niels Thykier authored Dec 29, 2017 and Sean Whitton committed May 13, 2018

Signed-off-by: Niels Thykier <niels@thykier.net>