in /etc/mail.

our smtpd is something other than sendmail.

the -E flag here causes the kernel to printf 'IP Filter: already
initialized'.

Markus Friedl.

for XPG conformance.  We don't use it but programs might check for it.

in some MAKEDEVs, will see to them in a separate commit.

commit, as we want our documentation to be as consistently formatted as
possible (it's getting there :-)).

http://playground.iijlab.net/i-d/draft-itojun-ipv6-transition-abuse-00.txt

with this `!' lines in /etc/hostname.* run even without certain lines
(like a comment) preceeding it.

appropriate mdoc macros to handle these cases.

depending on IFS).  This replaces the ed and sed code previously
used to do this.

least, this is the impression I get from looking at a lot of Perl docs.

Really, there should be a way to make configurable by the admin
at runtime (say, a gettmpdir() function).

when no neighboring router is found (rare case).  this is to conform
strictly to the ND spec.  it is safe to leave it empty.