178024 – mail/archmbox -- uses fuser(1) with incompatible flags on BSD

no flags

	It appears that archmbox supports using either fuser(1), fstat(1),
	or lsof to determine if a classic UNIX mail spool (mailbox) is
	actively in use (and thus skip it).

	src/archmbox.pl.in has this code in it:

 100 my $FUSER       = "@FUSER@";
....
1710 if ($FUSER =~ /.*fuser$/) {
1711         return system("$FUSER -s \"$mbox\"");
1712 }

	Where @FUSER@ comes from the configure phase (and is detected as
	/usr/bin/fuser on FreeBSD 9.1).

	However, the fuser syntax used is not compatible with BSD.  The -s
	argument on BSD provides a signal name to pass to the PID, rather
	than SIGKILL.  On Linux (where this software is obviously developed)
	the -s flag indicates "silent operation".

	The end result is that an error is clearly shown during operation:

fuser: illegal signal name: /home/jdc/some-spool-file
Mailbox '/home/jdc/some-spool-file': 329 messages (2.68 MB)
Archived:                            251 messages (2.11 MB)

	...as shown -- and worse -- the mail archival continues on anyway.
	This is very dangerous as there's a good chance this program could
	cause mail spool corruption as a result of the fuser use not being
	correct.  (Please do not lecture me about using Maildir format --
	let's stick to the problem at hand).

	It's very important to understand that our fuser(1) is very different
	in implementation (and output) than Linux; they are not interchangable
	and not just due to command-line flag differences.  You must read
	the entire Linux fuser man page (not skim it) to truly understand.

	There's also this entry in ChangeLog, dated 2004:

2004-05-03
Alessandro Dotti Contra <adotti@users.sourceforge.net>
* configure.in: a check for fstat was added. It can be used as a
  replacement for fuser on *BSD systems.

	Back to the archmbox code: if $FUSER matches .*fstat$ then that
	model is used, which is supposed to be BSD-compatible.  The code
	for fstat(1) support is "odd" but does seem to be correct.

	As such, I believe we should force configure to look for fstat
	and lsof only, and remove fuser from the picture entirely.

	Patching configure is probably the best way to do this.  (Note
	that I don't patch configure.in because this program is a single
	perl script, and I feel pulling in autoconf/automake just for
	this purpose is silly.  Plus configure.in is for autoconf 2.61
	and Makefile.in is for automake 1.10 -- both ancient and those
	templates might not work on newer stuff).

Fix: Add the below patch.  Patch will also be available here once I
	get a GNATS PR number:

	http://jdc.koitsu.org/freebsd/{prnum}/

	Also, I feel this strongly warrants a PORTREVISION increase
	given the nature of the situation.
How-To-Repeat: 	See Description.