FM / bin

/usr/bin

Name	Size	Mode	Actions
.ssh.hmac	65	0644	edit dl rm
a2p	106792	0755	edit dl rm
aclocal	31181	0755	edit dl rm
aclocal-1.11	31181	0755	edit dl rm
addftinfo	23488	0755	edit dl rm
addr2line	25480	0755	edit dl rm
animate	5848	0755	edit dl rm
ar	56624	0755	edit dl rm
as	328392	0755	edit dl rm
aspell	164064	0755	edit dl rm
at	1036	0755	edit dl rm
atq	1038	0755	edit dl rm
atrm	1040	0755	edit dl rm
autoconf	14631	0755	edit dl rm
autoheader	8484	0755	edit dl rm
autom4te	31789	0755	edit dl rm
automake	257062	0755	edit dl rm
automake-1.11	257062	0755	edit dl rm
autoreconf	20233	0755	edit dl rm
autoscan	17065	0755	edit dl rm
autoupdate	33766	0755	edit dl rm
awk	375616	0755	edit dl rm
base64	29240	0755	edit dl rm
bashbug-64	6932	0755	edit dl rm
batch	137	0755	edit dl rm
bdftops	292	0755	edit dl rm
bison	299856	0755	edit dl rm
bunzip2	32936	0755	edit dl rm
bzcat	32936	0755	edit dl rm
bzcmp	2128	0755	edit dl rm
bzdiff	2128	0755	edit dl rm
bzgrep	1677	0755	edit dl rm
bzip2	32936	0755	edit dl rm
bzip2recover	10872	0755	edit dl rm
bzless	1259	0755	edit dl rm
bzmore	1259	0755	edit dl rm
c++	267928	0755	edit dl rm
c++filt	23688	0755	edit dl rm
c2ph	36601	0755	edit dl rm
c89	224	0755	edit dl rm
c99	215	0755	edit dl rm
cal	16784	0755	edit dl rm
captoinfo	49832	0755	edit dl rm
catchsegv	3384	0755	edit dl rm
cc	264472	0755	edit dl rm
chcon	57144	0755	edit dl rm
chrt	9624	0755	edit dl rm
cksum	25272	0755	edit dl rm
cldetect	10689	0755	edit dl rm
clear	4976	0755	edit dl rm
cloudlinux-awp-user	1818	0755	edit dl rm
clwpos-user	1818	0755	edit dl rm
cmp	19248	0755	edit dl rm
col	10904	0755	edit dl rm
colcrt	7920	0755	edit dl rm
colrm	5576	0755	edit dl rm
column	9744	0755	edit dl rm
comm	28456	0755	edit dl rm
compare	5968	0755	edit dl rm
composite	5848	0755	edit dl rm
conjure	5848	0755	edit dl rm
convert	5848	0755	edit dl rm
cpan	11839	0755	edit dl rm
cpp	267912	0755	edit dl rm
crontab	1388	0755	edit dl rm
crontab.cagefs	308048	0755	edit dl rm
csplit	106168	0755	edit dl rm
curl	120512	0755	edit dl rm
cut	41704	0755	edit dl rm
dbiprof	6300	0755	edit dl rm
dbiproxy	5482	0755	edit dl rm
ddate	11448	0755	edit dl rm
diff	81080	0755	edit dl rm
diff3	23480	0755	edit dl rm
dig	133688	0755	edit dl rm
dir	109208	0755	edit dl rm
dircolors	32872	0755	edit dl rm
dirname	23720	0755	edit dl rm
display	5848	0755	edit dl rm
dltest	7232	0755	edit dl rm
dprofpp	24089	0755	edit dl rm
du	95448	0755	edit dl rm
dumphint	554	0755	edit dl rm
dvipdf	1057	0755	edit dl rm
enc2xs	39147	0755	edit dl rm
enchant	13136	0755	edit dl rm
enchant-lsmod	7336	0755	edit dl rm
env	23832	0755	edit dl rm
eps2eps	632	0755	edit dl rm
eqn	137328	0755	edit dl rm
eqn2graph	2242	0755	edit dl rm
expand	27960	0755	edit dl rm
expr	97688	0755	edit dl rm
factor	44696	0755	edit dl rm
fc-cache	13000	0755	edit dl rm
fc-cat	11136	0755	edit dl rm
fc-list	8840	0755	edit dl rm
fc-match	9992	0755	edit dl rm
fc-query	7568	0755	edit dl rm
fc-scan	7872	0755	edit dl rm
file	15680	0755	edit dl rm
find	234512	0755	edit dl rm
find2perl	23614	0755	edit dl rm
flex	332448	0755	edit dl rm
flex++	332448	0755	edit dl rm
flock	10928	0755	edit dl rm
floppy	23616	0755	edit dl rm
fmt	30264	0755	edit dl rm
fold	28024	0755	edit dl rm
font2c	300	0755	edit dl rm
free	9696	0755	edit dl rm
freetype-config	3830	0755	edit dl rm
funzip	22056	0755	edit dl rm
g++	267928	0755	edit dl rm
gawk	375616	0755	edit dl rm
gcc	264472	0755	edit dl rm
gcov	39848	0755	edit dl rm
gencat	23048	0755	edit dl rm
geoiplookup	15064	0755	edit dl rm
geoiplookup6	10904	0755	edit dl rm
geqn	137328	0755	edit dl rm
GET	14519	0755	edit dl rm
getconf	22808	0755	edit dl rm
getent	27776	0755	edit dl rm
getopt	12040	0755	edit dl rm
ghostscript	6760	0755	edit dl rm
gindxbib	27824	0755	edit dl rm
git	1139544	0755	edit dl rm
git-receive-pack	1139560	0755	edit dl rm
git-shell	461304	0755	edit dl rm
git-upload-archive	1139560	0755	edit dl rm
git-upload-pack	471216	0755	edit dl rm
glookbib	33320	0755	edit dl rm
gm	4856	0755	edit dl rm
gmake	170576	0755	edit dl rm
gneqn	255	0755	edit dl rm
gnroff	2401	0755	edit dl rm
gpg	761688	0755	edit dl rm
gpg-agent	297976	0755	edit dl rm
gpg-error	18576	0755	edit dl rm
gpg-zip	3303	0755	edit dl rm
gpg2	761688	0755	edit dl rm
gpgsplit	48536	0755	edit dl rm
gpgv	336480	0755	edit dl rm
gpgv2	336480	0755	edit dl rm
gpic	213616	0755	edit dl rm
gprof	94960	0755	edit dl rm
grefer	122224	0755	edit dl rm
grn	65408	0755	edit dl rm
grodvi	81400	0755	edit dl rm
groff	65424	0755	edit dl rm
groffer	7777	0755	edit dl rm
grolbp	87960	0755	edit dl rm
grolj4	77464	0755	edit dl rm
grops	117008	0755	edit dl rm
grotty	77304	0755	edit dl rm
groups	24408	0755	edit dl rm
gs	6760	0755	edit dl rm
gsbj	337	0755	edit dl rm
gsdj	339	0755	edit dl rm
gsdj500	342	0755	edit dl rm
gslj	340	0755	edit dl rm
gslp	337	0755	edit dl rm
gsnd	264	0755	edit dl rm
gsoelim	23512	0755	edit dl rm
gtbl	98176	0755	edit dl rm
gtroff	354864	0755	edit dl rm
gunzip	61	0755	edit dl rm
gzexe	5935	0755	edit dl rm
gzip	64688	0755	edit dl rm
h2ph	28036	0755	edit dl rm
h2xs	60385	0755	edit dl rm
head	32520	0755	edit dl rm
hexdump	21576	0755	edit dl rm
host	119928	0755	edit dl rm
hostid	22056	0755	edit dl rm
hpftodit	20384	0755	edit dl rm
hunspell	52784	0755	edit dl rm
iconv	60272	0755	edit dl rm
icu-config	11187	0755	edit dl rm
id	28104	0755	edit dl rm
identify	5968	0755	edit dl rm
idn	32488	0755	edit dl rm
ifnames	4049	0755	edit dl rm
import	5848	0755	edit dl rm
indxbib	27824	0755	edit dl rm
infocmp	50960	0755	edit dl rm
infotocap	49832	0755	edit dl rm
install	107200	0755	edit dl rm
instmodsh	4253	0755	edit dl rm
ionice	15112	0755	edit dl rm
ipcrm	9064	0755	edit dl rm
ipcs	19720	0755	edit dl rm
isosize	7320	0755	edit dl rm
ispell	988	0755	edit dl rm
isql	27616	0755	edit dl rm
iusql	21576	0755	edit dl rm
join	40360	0755	edit dl rm
kill	11576	0755	edit dl rm
ld	588496	0755	edit dl rm
ldd	5325	0755	edit dl rm
less	149976	0755	edit dl rm
lessecho	7376	0755	edit dl rm
lesskey	16264	0755	edit dl rm
lesspipe.sh	2804	0755	edit dl rm
lex	332448	0755	edit dl rm
libnetcfg	15724	0755	edit dl rm
libtool	283333	0755	edit dl rm
libtoolize	68161	0755	edit dl rm
lkbib	33544	0755	edit dl rm
locale	38640	0755	edit dl rm
localedef	326880	0755	edit dl rm
logger	11608	0755	edit dl rm
logname	22152	0755	edit dl rm
look	8080	0755	edit dl rm
lookbib	33320	0755	edit dl rm
lprsetup.sh	4661	0755	edit dl rm
lynx	1390984	0755	edit dl rm
m4	208520	0755	edit dl rm
Mail	378720	0755	edit dl rm
make	170576	0755	edit dl rm
mcookie	11032	0755	edit dl rm
md5sum	32472	0755	edit dl rm
mesg	6744	0755	edit dl rm
mkfifo	25272	0755	edit dl rm
mogrify	5848	0755	edit dl rm
montage	5848	0755	edit dl rm
msql2mysql	1956	0755	edit dl rm
mysql	3844478	0755	edit dl rm
mysqlaccess	112528	0755	edit dl rm
mysqladmin	3529601	0755	edit dl rm
mysqlbinlog	3727752	0755	edit dl rm
mysqlcheck	3526305	0755	edit dl rm
mysqldump	3603495	0755	edit dl rm
mysqlimport	3526103	0755	edit dl rm
mysqlshow	3519973	0755	edit dl rm
mysql_config	7016	0755	edit dl rm
mysql_find_rows	3791	0755	edit dl rm
mysql_waitpid	3273073	0755	edit dl rm
my_print_defaults	3275254	0755	edit dl rm
namei	12712	0755	edit dl rm
nano	171784	0755	edit dl rm
neqn	255	0755	edit dl rm
net-snmp-create-v3-user	2961	0755	edit dl rm
nl	98120	0755	edit dl rm
nm	41280	0755	edit dl rm
nohup	26184	0755	edit dl rm
nproc	24264	0755	edit dl rm
nroff	2401	0755	edit dl rm
nslookup	120120	0755	edit dl rm
nsupdate	59528	0755	edit dl rm
objcopy	212264	0755	edit dl rm
objdump	284936	0755	edit dl rm
od	58152	0755	edit dl rm
odbcinst	23328	0755	edit dl rm
odbc_config	6808	0755	edit dl rm
openssl	525600	0755	edit dl rm
pango-querymodules-64	10176	0755	edit dl rm
pango-view	49688	0755	edit dl rm
passwd	1044	0755	edit dl rm
paste	25544	0755	edit dl rm
patch	118104	0755	edit dl rm
pathchk	23752	0755	edit dl rm
pdf2dsc	696	0755	edit dl rm
pdf2ps	901	0755	edit dl rm
pdfopt	547	0755	edit dl rm
perl	7184	0755	edit dl rm
perl5.10.1	7184	0755	edit dl rm
perlbug	44726	0755	edit dl rm
perldoc	224	0755	edit dl rm
perlivp	12303	0755	edit dl rm
perlml	4480	0755	edit dl rm
perlthanks	44726	0755	edit dl rm
pf2afm	495	0755	edit dl rm
pfbtopfa	511	0755	edit dl rm
pfbtops	6776	0755	edit dl rm
pgrep	16144	0755	edit dl rm
php	937	0755	edit dl rm
php-cli	933	0755	edit dl rm
php5	933	0755	edit dl rm
php5-cli	933	0755	edit dl rm
pic	213616	0755	edit dl rm
pic2graph	2563	0755	edit dl rm
pico	171784	0755	edit dl rm
piconv	7337	0755	edit dl rm
pinentry	2602	0755	edit dl rm
pinentry-curses	48600	0755	edit dl rm
pinky	29608	0755	edit dl rm
pkg-config	105888	0755	edit dl rm
pkill	16144	0755	edit dl rm
pl2pm	4531	0755	edit dl rm
pmap	12136	0755	edit dl rm
pod2html	2338	0755	edit dl rm
pod2latex	10255	0755	edit dl rm
pod2man	21175	0755	edit dl rm
pod2text	9080	0755	edit dl rm
pod2usage	3342	0755	edit dl rm
podchecker	3699	0755	edit dl rm
podselect	2527	0755	edit dl rm
post-grohtml	131608	0755	edit dl rm
pr	61768	0755	edit dl rm
pre-grohtml	70640	0755	edit dl rm
precat	5656	0755	edit dl rm
preunzip	5656	0755	edit dl rm
prezip	5656	0755	edit dl rm
prezip-bin	7152	0755	edit dl rm
printafm	386	0755	edit dl rm
printenv	23736	0755	edit dl rm
printf	46344	0755	edit dl rm
protoize	68664	0755	edit dl rm
prove	9369	0755	edit dl rm
ps2ascii	786	0755	edit dl rm
ps2epsi	2772	0755	edit dl rm
ps2pdf	315	0755	edit dl rm
ps2pdf12	260	0755	edit dl rm
ps2pdf13	260	0755	edit dl rm
ps2pdf14	260	0755	edit dl rm
ps2pdfwr	1088	0755	edit dl rm
ps2ps	634	0755	edit dl rm
ps2ps2	704	0755	edit dl rm
psed	53325	0755	edit dl rm
pstruct	36601	0755	edit dl rm
ptx	127064	0755	edit dl rm
pv.sh	1420	0755	edit dl rm
pwdx	6744	0755	edit dl rm
pydoc	78	0755	edit dl rm
python	4864	0755	edit dl rm
python2	4864	0755	edit dl rm
python2.6	4864	0755	edit dl rm
quota	82752	0755	edit dl rm
ranlib	56624	0755	edit dl rm
readelf	302608	0755	edit dl rm
readlink	36360	0755	edit dl rm
recode	40168	0755	edit dl rm
refer	122224	0755	edit dl rm
rename	6752	0755	edit dl rm
renice	7320	0755	edit dl rm
reset	17896	0755	edit dl rm
rev	6784	0755	edit dl rm
rnano	171784	0755	edit dl rm
rpcgen	93000	0755	edit dl rm
run-with-aspell	85	0755	edit dl rm
runcon	28104	0755	edit dl rm
rvim	2288088	0755	edit dl rm
s2p	53325	0755	edit dl rm
scl	18304	0755	edit dl rm
scl_enabled	258	0755	edit dl rm
scl_source	1870	0755	edit dl rm
scp	75848	0755	edit dl rm
screen	383096	0755	edit dl rm
script	12624	0755	edit dl rm
sdiff	23568	0755	edit dl rm
selectorctl	7784	0755	edit dl rm
seq	40280	0755	edit dl rm
setsid	5536	0755	edit dl rm
setterm	20784	0755	edit dl rm
sftp	104528	0755	edit dl rm
sha1sum	36280	0755	edit dl rm
sha224sum	42136	0755	edit dl rm
sha256sum	42136	0755	edit dl rm
sha384sum	48568	0755	edit dl rm
sha512sum	48568	0755	edit dl rm
shred	48896	0755	edit dl rm
shuf	36408	0755	edit dl rm
size	28040	0755	edit dl rm
skill	15104	0755	edit dl rm
slabtop	12888	0755	edit dl rm
slogin	450728	0755	edit dl rm
snice	15104	0755	edit dl rm
snmpconf	26137	0755	edit dl rm
soelim	23512	0755	edit dl rm
spell	122	0755	edit dl rm
splain	17452	0755	edit dl rm
split	52824	0755	edit dl rm
sprof	23104	0755	edit dl rm
sqlite3	52680	0755	edit dl rm
ssh	450728	0755	edit dl rm
ssh-add	163016	0755	edit dl rm
ssh-agent	145480	0755	edit dl rm
ssh-copy-id	1425	0755	edit dl rm
ssh-keygen	203976	0755	edit dl rm
ssh-keyscan	253752	0755	edit dl rm
stat	46152	0755	edit dl rm
stdbuf	60920	0755	edit dl rm
strace	433560	0755	edit dl rm
stream	5848	0755	edit dl rm
strings	28040	0755	edit dl rm
strip	212264	0755	edit dl rm
sum	32096	0755	edit dl rm
tabs	11192	0755	edit dl rm
tac	93720	0755	edit dl rm
tail	57688	0755	edit dl rm
tailf	8520	0755	edit dl rm
tbl	98176	0755	edit dl rm
tclsh	5224	0755	edit dl rm
tclsh8.5	5224	0755	edit dl rm
tee	24184	0755	edit dl rm
test	30248	0755	edit dl rm
tfmtodit	23560	0755	edit dl rm
tic	49832	0755	edit dl rm
time	14136	0755	edit dl rm
timeout	46720	0755	edit dl rm
tload	7824	0755	edit dl rm
tmpwatch	17792	0755	edit dl rm
toe	11392	0755	edit dl rm
top	62448	0755	edit dl rm
tput	11504	0755	edit dl rm
tr	37608	0755	edit dl rm
troff	354864	0755	edit dl rm
truncate	48616	0755	edit dl rm
tset	17896	0755	edit dl rm
tsort	31976	0755	edit dl rm
tty	21928	0755	edit dl rm
tzselect	7131	0755	edit dl rm
uapi	1040	0755	edit dl rm
ul	13416	0755	edit dl rm
unexpand	28056	0755	edit dl rm
uniq	36472	0755	edit dl rm
unix-lpr.sh	4206	0755	edit dl rm
unprotoize	57504	0755	edit dl rm
unzip	167160	0755	edit dl rm
unzipsfx	76968	0755	edit dl rm
uptime	4840	0755	edit dl rm
users	24104	0755	edit dl rm
utmpdump	10936	0755	edit dl rm
vdir	109208	0755	edit dl rm
vim	2288088	0755	edit dl rm
vimdiff	2288088	0755	edit dl rm
vimtutor	2084	0755	edit dl rm
vmstat	20320	0755	edit dl rm
watch	12576	0755	edit dl rm
wc	32616	0755	edit dl rm
wftopfa	284	0755	edit dl rm
wget	357400	0755	edit dl rm
whereis	11456	0755	edit dl rm
which	20768	0755	edit dl rm
who	45016	0755	edit dl rm
whoami	23736	0755	edit dl rm
word-list-compress	6720	0755	edit dl rm
x86_64-redhat-linux-c++	267928	0755	edit dl rm
x86_64-redhat-linux-g++	267928	0755	edit dl rm
x86_64-redhat-linux-gcc	264472	0755	edit dl rm
xargs	44024	0755	edit dl rm
xmlcatalog	15152	0755	edit dl rm
xmllint	58888	0755	edit dl rm
xmlwf	22416	0755	edit dl rm
xsltproc	23536	0755	edit dl rm
xsubpp	4093	0755	edit dl rm
xxd	15160	0755	edit dl rm
yes	22120	0755	edit dl rm
zcmp	67	0755	edit dl rm
zdiff	4459	0755	edit dl rm
zegrep	62	0755	edit dl rm
zfgrep	62	0755	edit dl rm
zforce	2026	0755	edit dl rm
zgrep	5407	0755	edit dl rm
zip	212048	0755	edit dl rm
zipcloak	107104	0755	edit dl rm
zipgrep	2953	0755	edit dl rm
zipinfo	167160	0755	edit dl rm
zipnote	98584	0755	edit dl rm
zipsplit	102680	0755	edit dl rm
zless	1731	0755	edit dl rm
zmore	2605	0755	edit dl rm
znew	5270	0755	edit dl rm
zsoelim	23512	0755	edit dl rm
[	33408	0755	edit dl rm

Edit: /usr/bin/autoupdate (33766B)

#! /usr/bin/perl -w
# -*- perl -*-
# Generated from autoupdate.in; do not edit by hand.

# autoupdate - modernize an Autoconf file.
# Copyright (C) 1994, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006,
# 2007, 2008 Free Software Foundation, Inc.

# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2, or (at your option)
# any later version.

# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.

# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
# 02110-1301, USA.

# Originally written by David MacKenzie <djm@gnu.ai.mit.edu>.
# Rewritten by Akim Demaille <akim@freefriends.org>.

eval 'case $# in 0) exec /usr/bin/perl -S "$0";; *) exec /usr/bin/perl -S "$0" "$@";; esac'
    if 0;

BEGIN
{
  my $datadir = $ENV{'autom4te_perllibdir'} || '/usr/share/autoconf';
  unshift @INC, $datadir;

# Override SHELL.  On DJGPP SHELL may not be set to a shell
  # that can handle redirection and quote arguments correctly,
  # e.g.: COMMAND.COM.  For DJGPP always use the shell that configure
  # has detected.
  $ENV{'SHELL'} = '/bin/sh' if ($^O eq 'dos');
}

use Autom4te::ChannelDefs;
use Autom4te::Channels;
use Autom4te::Configure_ac;
use Autom4te::FileUtils;
use Autom4te::General;
use Autom4te::XFile;
use File::Basename;
use strict;

# Lib files.
my $autom4te = $ENV{'AUTOM4TE'} || '/usr/bin/autom4te';
my $autoconf = "$autom4te --language=autoconf";
# We need to find m4sugar.
my @prepend_include;
my @include = ('/usr/share/autoconf');
my $force = 0;
# m4.
my $m4 = $ENV{"M4"} || '/usr/bin/m4';

# $HELP
# -----
$help = "Usage: $0 [OPTION]... [TEMPLATE-FILE]...

Update each TEMPLATE-FILE if given, or `configure.ac' if present,
or else `configure.in', to the syntax of the current version of
Autoconf.  The original files are backed up.

Operation modes:
  -h, --help                 print this help, then exit
  -V, --version              print version number, then exit
  -v, --verbose              verbosely report processing
  -d, --debug                don't remove temporary files
  -f, --force                consider all files obsolete

Library directories:
  -B, --prepend-include=DIR  prepend directory DIR to search path
  -I, --include=DIR          append directory DIR to search path

Report bugs to <bug-autoconf\@gnu.org>.
";

# $VERSION
# --------
$version = "autoupdate (GNU Autoconf) 2.63
Copyright (C) 2008 Free Software Foundation, Inc.
License GPLv2+: GNU GPL version 2 or later
<http://gnu.org/licenses/old-licenses/gpl-2.0.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.

Written by David J. MacKenzie and Akim Demaille.
";

## ---------- ##
## Routines.  ##
## ---------- ##

# parse_args ()
# -------------
# Process any command line arguments.
sub parse_args ()
{
  my $srcdir;

getopt ('I|include=s'         => \@include,
	  'B|prepend-include=s' => \@prepend_include,
	  'f|force'             => \$force);

if (! @ARGV)
    {
      my $configure_ac = require_configure_ac;
      push @ARGV, $configure_ac;
    }
}

# ----------------- #
# Autoconf macros.  #
# ----------------- #

my (%ac_macros, %au_macros, %m4_builtins);

# HANDLE_AUTOCONF_MACROS ()
# -------------------------
# @M4_BUILTINS -- M4 builtins and a useful comment.
sub handle_autoconf_macros ()
{
  # Get the builtins.
  xsystem ("echo dumpdef | $m4 2>" . shell_quote ("$tmp/m4.defs") . " >/dev/null");
  my $m4_defs = new Autom4te::XFile "< " . open_quote ("$tmp/m4.defs");
  while ($_ = $m4_defs->getline)
    {
      $m4_builtins{$1} = 1
	if /^(\w+):/;
    }
  $m4_defs->close;

my $macros = new Autom4te::XFile ("$autoconf"
				    . " --trace AU_DEFINE:'AU:\$f:\$1'"
				    . " --trace define:'AC:\$f:\$1'"
				    . " --melt /dev/null |");
  while ($_ = $macros->getline)
    {
      chomp;
      my ($domain, $file, $macro) = /^(AC|AU):(.*):([^:]*)$/ or next;
      if ($domain eq "AU")
	{
	  $au_macros{$macro} = 1;
	}
      elsif ($file =~ /(^|\/)m4sugar\/(m4sugar|version)\.m4$/)
	{
	  # Add the m4sugar macros to m4_builtins.
	  $m4_builtins{$macro} = 1;
	}
      else
	{
	  # Autoconf, aclocal, and m4sh macros.
	  $ac_macros{$macro} = 1;
	}
    }
  $macros->close;

# Don't keep AU macros in @AC_MACROS.
  delete $ac_macros{$_}
    foreach (keys %au_macros);
  # Don't keep M4sugar macros which are redefined by Autoconf,
  # such as `builtin', `changequote' etc.  See autoconf/autoconf.m4.
  delete $ac_macros{$_}
    foreach (keys %m4_builtins);
  error "no current Autoconf macros found"
    unless keys %ac_macros;
  error "no obsolete Autoconf macros found"
    unless keys %au_macros;

if ($debug)
    {
      print STDERR "Current Autoconf macros:\n";
      print STDERR join (' ', sort keys %ac_macros) . "\n\n";
      print STDERR "Obsolete Autoconf macros:\n";
      print STDERR join (' ', sort keys %au_macros) . "\n\n";
    }

# ac.m4 -- autoquoting definitions of the AC macros (M4sugar excluded).
  # unac.m4 -- undefine the AC macros.
  my $ac_m4 = new Autom4te::XFile "> " . open_quote ("$tmp/ac.m4");
  print $ac_m4 "# ac.m4 -- autoquoting definitions of the AC macros.\n";
  my $unac_m4 = new Autom4te::XFile "> " . open_quote ("$tmp/unac.m4");
  print $unac_m4 "# unac.m4 -- undefine the AC macros.\n";
  foreach (sort keys %ac_macros)
    {
      print $ac_m4   "_au_m4_define([$_], [m4_if(\$#, 0, [[\$0]], [[\$0(\$\@)]])])\n";
      print $unac_m4 "_au_m4_undefine([$_])\n";
    }

# m4save.m4 -- save the m4 builtins.
  # unm4.m4 -- disable the m4 builtins.
  # m4.m4 -- enable the m4 builtins.
  my $m4save_m4 = new Autom4te::XFile "> " . open_quote ("$tmp/m4save.m4");
  print $m4save_m4 "# m4save.m4 -- save the m4 builtins.\n";
  my $unm4_m4 = new Autom4te::XFile "> " . open_quote ("$tmp/unm4.m4");
  print $unm4_m4 "# unm4.m4 -- disable the m4 builtins.\n";
  my $m4_m4 = new Autom4te::XFile "> " . open_quote ("$tmp/m4.m4");
  print $m4_m4 "# m4.m4 -- enable the m4 builtins.\n";
  foreach (sort keys %m4_builtins)
    {
      print $m4save_m4 "_au__save([$_])\n";
      print $unm4_m4   "_au__undefine([$_])\n";
      print $m4_m4     "_au__restore([$_])\n";
    }
}

## -------------- ##
## Main program.  ##
## -------------- ##

parse_args;
$autoconf .= " --debug" if $debug;
$autoconf .= " --force" if $force;
$autoconf .= " --verbose" if $verbose;
$autoconf .= join (' --include=', '', map { shell_quote ($_) } @include);
$autoconf .= join (' --prepend-include=', '', map { shell_quote ($_) } @prepend_include);

mktmpdir ('au');
handle_autoconf_macros;

# $au_changequote -- enable the quote `[', `]' right before any AU macro.
my $au_changequote =
  's/\b(' . join ('|', keys %au_macros) . ')\b/_au_m4_changequote([,])$1/g';

# au.m4 -- definitions the AU macros.
xsystem ("$autoconf --trace AU_DEFINE:'_au_defun(\@<:\@\$1\@:>\@,
\@<:\@\$2\@:>\@)' --melt /dev/null "
	. ">" . shell_quote ("$tmp/au.m4"));

## ------------------- ##
## Process the files.  ##
## ------------------- ##

foreach my $file (@ARGV)
  {
    # We need an actual file.
    if ($file eq '-')
      {
	$file = "$tmp/stdin";
	system "cat >" . shell_quote ($file);
      }
    elsif (! -r "$file")
      {
	die "$me: $file: No such file or directory";
      }

# input.m4 -- m4 program to produce the updated file.
    # Load the values, the dispatcher, neutralize m4, and the prepared
    # input file.
    my $input_m4 = <<\EOF;
      divert(-1)                                            -*- Autoconf -*-
      changequote([,])

# Define our special macros:
      define([_au__defn], defn([defn]))
      define([_au__divert], defn([divert]))
      define([_au__ifdef], defn([ifdef]))
      define([_au__include], defn([include]))
      define([_au___undefine], defn([undefine]))
      define([_au__undefine], [_au__ifdef([$1], [_au___undefine([$1])])])
      define([_au__save], [m4_ifdef([$1], [m4_copy([$1], [_au_$1])])])
      define([_au__restore],
	[_au_m4_ifdef([_au_$1],
	  [_au_m4_define([$1], _au__defn([_au_$1]))])])

# Set up m4sugar.
      include(m4sugar/m4sugar.m4)

# Redefine __file__ to make warnings nicer; $file is replaced below.
      m4_define([__file__], [$file])

# Redefine m4_location to fix the line number.
      m4_define([m4_location], [__file__:m4_eval(__line__ - _au__first_line)])

# Move all the builtins into the `_au_' pseudo namespace
      m4_include([m4save.m4])

# _au_defun(NAME, BODY)
      # ---------------------
      # Define NAME to BODY, plus AU activation/deactivation.
      _au_m4_define([_au_defun],
      [_au_m4_define([$1],
      [_au_enable()dnl
      $2[]dnl
      _au_disable()])])

# Import the definition of the obsolete macros.
      _au__include([au.m4])

## ------------------------ ##
      ## _au_enable/_au_disable.  ##
      ## ------------------------ ##

# They work by pair: each time an AU macro is activated, it runs
      # _au_enable, and at its end its runs _au_disable (see _au_defun
      # above).  AU macros might use AU macros, which should
      # enable/disable only for the outer AU macros.
      #
      # `_au_enabled' is used to this end, determining whether we really
      # enable/disable.

# __au_enable
      # -----------
      # Reenable the builtins, m4sugar, and the autoquoting AC macros.
      _au_m4_define([__au_enable],
      [_au__divert(-1)
      # Enable special characters.
      _au_m4_changecom([#])

_au__include([m4.m4])
      _au__include([ac.m4])

_au__divert(0)])

# _au_enable
      # ----------
      # Called at the beginning of all the obsolete macros.  If this is the
      # outermost level, call __au_enable.
      _au_m4_define([_au_enable],
      [_au_m4_ifdef([_au_enabled],
		 [],
		 [__au_enable()])_au_dnl
      _au_m4_pushdef([_au_enabled])])

# __au_disable
      # ------------
      # Disable the AC autoquoting macros, m4sugar, and m4.
      _au_m4_define([__au_disable],
      [_au__divert(-1)
      _au__include([unac.m4])
      _au__include([unm4.m4])

# Disable special characters.
      _au_m4_changequote()
      _au_m4_changecom()

_au__divert(0)])

# _au_disable
      # -----------
      # Called at the end of all the obsolete macros.  If we are at the
      # outermost level, call __au_disable.
      _au_m4_define([_au_disable],
      [_au_m4_popdef([_au_enabled])_au_dnl
      _au_m4_ifdef([_au_enabled],
		[],
		[__au_disable()])])

## ------------------------------- ##
      ## Disable, and process the file.  ##
      ## ------------------------------- ##
      # The AC autoquoting macros are not loaded yet, hence invoking
      # `_au_disable' would be wrong.
      _au__include([unm4.m4])

# Disable special characters, and set the first line number.
      _au_m4_changequote()
      _au_m4_changecom()

_au_m4_define(_au__first_line, _au___line__)_au__divert(0)_au_dnl
EOF

$input_m4 =~ s/^      //mg;
    $input_m4 =~ s/\$file/$file/g;

# prepared input -- input, but reenables the quote before each AU macro.
    open INPUT_M4, "> " . open_quote ("$tmp/input.m4")
       or error "cannot open: $!";
    open FILE, "< " . open_quote ($file)
       or error "cannot open: $!";
    print INPUT_M4 "$input_m4";
    while (<FILE>)
       {
	 eval $au_changequote;
	 print INPUT_M4;
       }
    close FILE
       or error "cannot close $file: $!";
    close INPUT_M4
       or error "cannot close $tmp/input.m4: $!";

# Now ask m4 to perform the update.
    xsystem ("$m4 --include=" . shell_quote ($tmp)
	     . join (' --include=', '', map { shell_quote ($_) } reverse (@prepend_include))
	     . join (' --include=', '', map { shell_quote ($_) } @include)
	     . " " . shell_quote ("$tmp/input.m4") . " > " . shell_quote ("$tmp/updated"));
    update_file ("$tmp/updated",
		 "$file" eq "$tmp/stdin" ? '-' : "$file");
  }
exit 0;

#		  ## ---------------------------- ##
#		  ## How `autoupdate' functions.  ##
#		  ## ---------------------------- ##
#
# The task of `autoupdate' is not trivial: the biggest difficulty being
# that you must limit the changes to the parts that really need to be
# updated.  Finding a satisfying implementation proved to be quite hard,
# as this is the fifth implementation of `autoupdate'.
#
# Below, we will use a simple example of obsolete macro:
#
#     AU_DEFUN([OLD], [NEW([$1, $2], m4_eval([$1 + $2]))])
#     AC_DEFUN([NEW], [echo "sum($1) = $2"])
#
# the input file contains
#
#     dnl The Unbelievable Truth
#     OLD(1, 2)
#     NEW([0, 0], [0])
#
# Of course the expected output is
#
#     dnl The Unbelievable Truth
#     NEW([1, 2], [3])
#     NEW([0, 0], [0])
#
#
# # First implementation: sed
# # =========================
#
# The first implementation was only able to change the name of obsolete
# macros.
#
# The file `acoldnames.m4' defined the old names based on the new names.
# It was simple then to produce a sed script such as:
#
#     s/OLD/NEW/g
#
# Updating merely consisted in running this script on the file to
# update.
#
# This scheme suffers an obvious limitation: that `autoupdate' was
# unable to cope with new macros that just swap some of its arguments
# compared to the old macro.  Fortunately, that was enough to upgrade
# from Autoconf 1 to Autoconf 2.  (But I have no idea whether the
# changes in Autoconf 2 were precisely limited by this constraint.)
#
#
# # Second implementation: hooks
# # ============================
#
# The version 2.15 of Autoconf brought a vast number of changes compared
# to 2.13, so a solution was needed.  One could think to extend the
# `sed' scripts with specialized code for complex macros.  But this
# approach is of course full of flaws:
#
# a. the Autoconf maintainers have to write these snippets, which we
#    just don't want to,
#
# b. I really don't think you'll ever manage to handle the quoting of
#    m4 from sed.
#
# To satisfy a., let's remark that the code which implements the old
# features in term of the new feature is exactly the code which should
# replace the old code.
#
# To answer point b, as usual in the history of Autoconf, the answer, at
# least on the paper, is simple: m4 is the best tool to parse m4, so
# let's use m4.
#
# Therefore the specification is:
#
#     I want to be able to tell Autoconf, well, m4, that the macro I
#     am currently defining is an obsolete macro (so that the user is
#     warned), which code is the code to use when running autoconf,
#     but that the very same code has to be used when running
#     autoupdate.  To summarize, the interface I want is
#     `AU_DEFUN(OLD-NAME, NEW-CODE)'.
#
#
# Now for the technical details.
#
# When running autoconf, except for the warning, AU_DEFUN is basically
# AC_DEFUN.
#
# When running autoupdate, we want *only* OLD-NAMEs to be expanded.
# This obviously means that acgeneral.m4 and acspecific.m4 must not be
# loaded.  Nonetheless, because we want to use a rich set of m4
# features, m4sugar.m4 is needed.  Please note that the fact that
# Autoconf's macros are not loaded is positive on two points:
#
# - we do get an updated `configure.ac', not a `configure'!
#
# - the old macros are replaced by *calls* to the new-macros, not the
#   body of the new macros, since their body is not defined!!!
#   (Whoa, that's really beautiful!).
#
# Additionally we need to disable the quotes when reading the input for
# two reasons: first because otherwise `m4' will swallow the quotes of
# other macros:
#
#     NEW([1, 2], 3)
#     => NEW(1, 2, 3)
#
# and second, because we want to update the macro calls which are
# quoted, i.e., we want
#
#     FOO([OLD(1, 2)])
#     => FOO([NEW([1, 2], [3])])
#
# If we don't disable the quotes, only the macros called at the top
# level would be updated.
#
# So, let's disable the quotes.
#
# Well, not quite: m4sugar.m4 still needs to use quotes for some macros.
# Well, in this case, when running in autoupdate code, each macro first
# reestablishes the quotes, expands itself, and disables the quotes.
#
# Thinking a bit more, you realize that in fact, people may use `define'
# `ifelse' etc. in their files, and you certainly don't want to process
# them.  Another example is `dnl': you don't want to remove the
# comments.  You then realize you don't want exactly to import m4sugar:
# you want to specify when it is enabled (macros active), and disabled.
# m4sugar provides m4_disable/m4_enable to this end.
#
# You're getting close to it.  Now remains one task: how to handle
# twofold definitions?
#
# Remember that the same AU_DEFUN must be understood in two different
# ways, the AC way, and the AU way.
#
# One first solution is to check whether acgeneral.m4 was loaded.  But
# that's definitely not cute.  Another is simply to install `hooks',
# that is to say, to keep in some place m4 knows, late `define' to be
# triggered *only* in AU mode.
#
# You first think to design AU_DEFUN like this:
#
# 1. AC_DEFUN(OLD-NAME,
#	      [Warn the user OLD-NAME is obsolete.
#	       NEW-CODE])
#
# 2. Store for late AU binding([define(OLD_NAME,
#				[Reestablish the quotes.
#				 NEW-CODE
#				 Disable the quotes.])])
#
# but this will not work: NEW-CODE has probably $1, $2 etc. and these
# guys will be replaced with the argument of `Store for late AU binding'
# when you call it.
#
# I don't think there is a means to avoid this using this technology
# (remember that $1 etc. are *always* expanded in m4).  You may also try
# to replace them with $[1] to preserve them for a later evaluation, but
# if `Store for late AU binding' is properly written, it will remain
# quoted till the end...
#
# You have to change technology.  Since the problem is that `$1'
# etc. should be `consumed' right away, one solution is to define now a
# second macro, `AU_OLD-NAME', and to install a hook than binds OLD-NAME
# to AU_OLD-NAME.  Then, autoupdate.m4 just need to run the hooks.  By
# the way, the same method was used in autoheader.
#
#
# # Third implementation: m4 namespaces by m4sugar
# # ==============================================
#
# Actually, this implementation was just a clean up of the previous
# implementation: instead of defining hooks by hand, m4sugar was equipped
# with `namespaces'.  What are they?
#
# Sometimes we want to disable some *set* of macros, and restore them
# later.  We provide support for this via namespaces.
#
# There are basically three characters playing this scene: defining a
# macro in a namespace, disabling a namespace, and restoring a namespace
# (i.e., all the definitions it holds).
#
# Technically, to define a MACRO in NAMESPACE means to define the macro
# named `NAMESPACE::MACRO' to the VALUE.  At the same time, we append
# `undefine(NAME)' in the macro named `m4_disable(NAMESPACE)', and
# similarly a binding of NAME to the value of `NAMESPACE::MACRO' in
# `m4_enable(NAMESPACE)'.  These mechanisms allow to bind the macro of
# NAMESPACE and to unbind them at will.
#
# Of course this implementation is really inefficient: m4 has to grow
# strings which can become quickly huge, which slows it significantly.
#
# In particular one should avoid as much as possible to use `define' for
# temporaries.  Now that `define' has quite a complex meaning, it is an
# expensive operations that should be limited to macros.  Use
# `m4_define' for temporaries.
#
# Private copies of the macros we used in entering / exiting the m4sugar
# namespace.  It is much more convenient than fighting with the renamed
# version of define etc.
#
#
#
# Those two implementations suffered from serious problems:
#
# - namespaces were really expensive, and incurred a major performance
#   loss on `autoconf' itself, not only `autoupdate'.  One solution
#   would have been the limit the use of namespaces to `autoupdate', but
#   that's again some complications on m4sugar, which really doesn't need
#   this.  So we wanted to get rid of the namespaces.
#
# - since the quotes were disabled, autoupdate was sometimes making
#   wrong guesses, for instance on:
#
#     foo([1, 2])
#
#   m4 saw 2 arguments: `[1'and `2]'.  A simple solution, somewhat
#   fragile, is to reestablish the quotes right before all the obsolete
#   macros, i.e., to use sed so that the previous text becomes
#
#     changequote([, ])foo([1, 2])
#
#   To this end, one wants to trace the definition of obsolete macros.
#
# It was there that the limitations of the namespace approach became
# painful: because it was a complex machinery playing a lot with the
# builtins of m4 (hence, quite fragile), tracing was almost impossible.
#
#
# So this approach was dropped.
#
#
# # The fourth implementation: two steps
# # ====================================
#
# If you drop the uses of namespaces, you no longer can compute the
# updated value, and replace the old call with it simultaneously.
#
# Obviously you will use m4 to compute the updated values, but you may
# use some other tool to achieve the replacement.  Personally, I trust
# nobody but m4 to parse m4, so below, m4 will perform the two tasks.
#
# How can m4 be used to replace *some* macros calls with newer values.
# Well, that's dead simple: m4 should learn the definitions of obsolete
# macros, forget its builtins, disable the quotes, and then run on the
# input file, which amounts to doing this:
#
#     divert(-1)dnl
#     changequote([, ])
#     define([OLD], [NEW([$1, $2], m4_eval([$1 + $2]))changequote()])
#     undefine([dnl])
#     undefine([m4_eval])
#     # Some more undefines...
#     changequote()
#     divert(0)dnl
#     dnl The Unbelievable Truth
#     changequote([, ])OLD(1, 2)
#     NEW([0, 0],
#	  0)
#
# which will result in
#
#     dnl The Unbelievable Truth
#     NEW(1, 2, m4_eval(1 + 2))
#     NEW([0, 0],
#	  0)
#
# Grpmh.  Two problems.  A minor problem: it would have been much better
# to have the `m4_eval' computed, and a major problem: you lost the
# quotation in the result.
#
# Let's address the big problem first.  One solution is to define any
# modern macro to rewrite its calls with the proper quotation, thanks to
# `$@'.  Again, tracing the `define's makes it possible to know which
# are these macros, so you input is:
#
#     divert(-1)dnl
#     changequote([, ])
#     define([OLD], [NEW([$1, $2], m4_eval([$1 + $2]))changequote()])
#     define([NEW], [[NEW($@)]changequote()])
#     undefine([dnl])
#     undefine([m4_eval])
#     # Some more undefines...
#     changequote()
#     divert(0)dnl
#     dnl The Unbelievable Truth
#     changequote([, ])OLD(1, 2)
#     changequote([, ])NEW([0, 0],
#	  0)
#
# which results in
#
#     dnl The Unbelievable Truth
#     NEW([1, 2],[m4_eval(1 + 2)])
#     NEW([0, 0],[0])
#
# Our problem is solved, i.e., the first call to `NEW' is properly
# quoted, but introduced another problem: we changed the layout of the
# second calls, which can be a drama in the case of huge macro calls
# (think of `AC_TRY_RUN' for instance).  This example didn't show it,
# but we also introduced parens to macros which did not have some:
#
#     AC_INIT
#     => AC_INIT()
#
# No big deal for the semantics (unless the macro depends upon $#, which
# is bad), but the users would not be happy.
#
# Additionally, we introduced quotes that were not there before, which is
# OK in most cases, but could change the semantics of the file.
#
# Cruel dilemma: we do want the auto-quoting definition of `NEW' when
# evaluating `OLD', but we don't when we evaluate the second `NEW'.
# Back to namespaces?
#
# No.
#
#
# # Second step: replacement
# # ------------------------
#
# No, as announced above, we will work in two steps: in a first step we
# compute the updated values, and in a second step we replace them.  Our
# goal is something like this:
#
#     divert(-1)dnl
#     changequote([, ])
#     define([OLD], [NEW([1, 2], [3])changequote()])
#     undefine([dnl])
#     undefine([m4_eval])
#     # Some more undefines...
#     changequote()
#     divert(0)dnl
#     dnl The Unbelievable Truth
#     changequote([, ])OLD(1, 2)
#     NEW([0, 0],
#	  0)
#
# i.e., the new value of `OLD' is precomputed using the auto-quoting
# definition of `NEW' and the m4 builtins.  We'll see how afterwards,
# let's finish with the replacement.
#
# Of course the solution above is wrong: if there were other calls to
# `OLD' with different values, we would smash them to the same value.
# But it is quite easy to generalize the scheme above:
#
#     divert(-1)dnl
#     changequote([, ])
#     define([OLD([1],[2])], [NEW([1, 2], [3])])
#     define([OLD], [defn([OLD($@)])changequote()])
#     undefine([dnl])
#     undefine([m4_eval])
#     # Some more undefines...
#     changequote()
#     divert(0)dnl
#     dnl The Unbelievable Truth
#     changequote([, ])OLD(1, 2)
#     NEW([0, 0],
#	  0)
#
# i.e., for each call to obsolete macros, we build an array `call =>
# value', and use a macro to dispatch these values.  This results in:
#
#     dnl The Unbelievable Truth
#     NEW([1, 2], [3])
#     NEW([0, 0],
#	  0)
#
# In French, we say `Youpi !', which you might roughly translate as
# `Yippee!'.
#
#
# # First step: computation
# # -----------------------
#
# Let's study the anatomy of the file, and name its sections:
#
# prologue
#     divert(-1)dnl
#     changequote([, ])
# values
#     define([OLD([1],[2])], [NEW([1, 2], [3])])
# dispatcher
#     define([OLD], [defn([OLD($@)])changequote()])
# disabler
#     undefine([dnl])
#     undefine([m4_eval])
#     # Some more undefines...
#     changequote()
#     divert(0)dnl
# input
#     dnl The Unbelievable Truth
#     changequote([, ])OLD(1, 2)
#     NEW([0, 0],
#	  0)
#
#
# # Computing the `values' section
# # ..............................
#
# First we need to get the list of all the AU macro uses.  To this end,
# first get the list of all the AU macros names by tracing `AU_DEFUN' in
# the initialization of autoconf.  This list is computed in the file
# `au.txt' below.
#
# Then use this list to trace all the AU macro uses in the input.  The
# goal is obtain in the case of our example:
#
#     [define([OLD([1],[2])],]@<<@OLD([1],[2])@>>@[)]
#
# This is the file `values.in' below.
#
# We want to evaluate this with only the builtins (in fact m4sugar), the
# auto-quoting definitions of the new macros (`new.m4'), and the
# definition of the old macros (`old.m4').  Computing these last two
# files is easy: it's just a matter of using the right `--trace' option.
#
# So the content of `values.in' is:
#
#     include($autoconf_dir/m4sugar.m4)
#     m4_include(new.m4)
#     m4_include(old.m4)
#     divert(0)dnl
#     [define([OLD([1],[2])],]@<<@OLD([1],[2])@>>@[)]
#
# We run m4 on it, which yields:
#
#     define([OLD([1],[2])],@<<@NEW([1, 2], [3])@>>@)
#
# Transform `@<<@' and `@>>@' into quotes and we get
#
#     define([OLD([1],[2])],[NEW([1, 2], [3])])
#
# This is `values.m4'.
#
#
# # Computing the `dispatcher' section
# # ..................................
#
# The `prologue', and the `disabler' are simple and need no commenting.
#
# To compute the `dispatcher' (`dispatch.m4'), again, it is a simple
# matter of using the right `--trace'.
#
# Finally, the input is not exactly the input file, rather it is the
# input file with the added `changequote'.  To this end, we build
# `quote.sed'.
#
#
# # Putting it all together
# # .......................
#
# We build the file `input.m4' which contains:
#
#     divert(-1)dnl
#     changequote([, ])
#     include(values.m4)
#     include(dispatch.m4)
#     undefine([dnl])
#     undefine([eval])
#     # Some more undefines...
#     changequote()
#     divert(0)dnl
#     dnl The Unbelievable Truth
#     changequote([, ])OLD(1, 2)
#     NEW([0, 0],
#	  0)
#
# And we just run m4 on it.  Et voila`, Monsieur !  Mais oui, mais oui.
#
# Well, there are a few additional technicalities.  For instance, we
# rely on `changequote', `ifelse' and `defn', but we don't want to
# interpret the changequotes of the user, so we simply use another name:
# `_au_changequote' etc.
#
#
# # Failure of the fourth approach
# # ------------------------------
#
# This approach is heavily based on traces, but then there is an obvious
# problem: non expanded code will never be seen.  In particular, the body
# of a `define' definition is not seen, so on the input
#
#	  define([idem], [OLD(0, [$1])])
#
# autoupdate would never see the `OLD', and wouldn't have updated it.
# Worse yet, if `idem(0)' was used later, then autoupdate sees that
# `OLD' is used, computes the result for `OLD(0, 0)' and sets up a
# dispatcher for `OLD'.  Since there was no computed value for `OLD(0,
# [$1])', the dispatcher would have replaced with... nothing, leading
# to
#
#	  define([idem], [])
#
# With some more thinking, you see that the two step approach is wrong,
# the namespace approach was much saner.
#
# But you learned a lot, in particular you realized that using traces
# can make it possible to simulate namespaces!
#
#
#
# # The fifth implementation: m4 namespaces by files
# # ================================================
#
# The fourth implementation demonstrated something unsurprising: you
# cannot precompute, i.e., the namespace approach was the right one.
# Still, we no longer want them, they're too expensive.  Let's have a
# look at the way it worked.
#
# When updating
#
#     dnl The Unbelievable Truth
#     OLD(1, 2)
#     NEW([0, 0], [0])
#
# you evaluate `input.m4':
#
#     divert(-1)
#     changequote([, ])
#     define([OLD],
#     [m4_enable()NEW([$1, $2], m4_eval([$1 + $2]))m4_disable()])
#     ...
#     m4_disable()
#     dnl The Unbelievable Truth
#     OLD(1, 2)
#     NEW([0, 0], [0])
#
# where `m4_disable' undefines the m4 and m4sugar, and disables the quotes
# and comments:
#
#     define([m4_disable],
#     [undefine([__file__])
#     ...
#     changecom(#)
#     changequote()])
#
# `m4_enable' does the converse: reestablish quotes and comments
# --easy--, reestablish m4sugar --easy: just load `m4sugar.m4' again-- and
# reenable the builtins.  This later task requires that you first save
# the builtins.  And BTW, the definition above of `m4_disable' cannot
# work: you undefined `changequote' before using it!  So you need to use
# your privates copies of the builtins.  Let's introduce three files for
# this:
#
#  `m4save.m4'
#    moves the m4 builtins into the `_au_' pseudo namespace,
#  `unm4.m4'
#    undefines the builtins,
#  `m4.m4'
#    restores them.
#
# So `input.m4' is:
#
#     divert(-1)
#     changequote([, ])
#
#     include([m4save.m4])
#
#     # Import AU.
#     define([OLD],
#     [m4_enable()NEW([$1, $2], m4_eval([$1 + $2]))m4_disable()])
#
#     define([_au_enable],
#     [_au_changecom([#])
#     _au_include([m4.m4])
#     _au_include(m4sugar.m4)])
#
#     define([_au_disable],
#     [# Disable m4sugar.
#     # Disable the m4 builtins.
#     _au_include([unm4.m4])
#     # 1. Disable special characters.
#     _au_changequote()
#     _au_changecom()])
#
#     m4_disable()
#     dnl The Unbelievable Truth
#     OLD(1, 2)
#     NEW([0, 0], [0])
#
# Based on what we learned in the fourth implementation we know that we
# have to enable the quotes *before* any AU macro, and we know we need
# to build autoquoting versions of the AC macros.  But the autoquoting
# AC definitions must be disabled in the rest of the file, and enabled
# inside AU macros.
#
# Using `autoconf --trace' it is easy to build the files
#
#   `ac.m4'
#     define the autoquoting AC fake macros
#   `disable.m4'
#     undefine the m4sugar and AC autoquoting macros.
#   `au.m4'
#     definitions of the AU macros (such as `OLD' above).
#
# Now, `input.m4' is:
#
#     divert(-1)
#     changequote([, ])
#
#     include([m4save.m4])
#     # Import AU.
#     include([au.m4])
#
#     define([_au_enable],
#     [_au_changecom([#])
#     _au_include([m4.m4])
#     _au_include(m4sugar.m4)
#     _au_include(ac.m4)])
#
#     define([_au_disable],
#     [_au_include([disable.m4])
#     _au_include([unm4.m4])
#     # 1. Disable special characters.
#     _au_changequote()
#     _au_changecom()])
#
#     m4_disable()
#     dnl The Unbelievable Truth
#     _au_changequote([, ])OLD(1, 2)
#     NEW([0, 0], [0])
#
# Finally, version V is ready.
#
# Well... almost.
#
# There is a slight problem that remains: if an AU macro OUTER includes
# an AU macro INNER, then _au_enable will be run when entering OUTER
# and when entering INNER (not good, but not too bad yet).  But when
# getting out of INNER, _au_disable will disable everything while we
# were still in OUTER.  Badaboom.
#
# Therefore _au_enable and _au_disable have to be written to work by
# pairs: each _au_enable pushdef's _au_enabled, and each _au_disable
# popdef's _au_enabled.  And of course _au_enable and _au_disable are
# effective when _au_enabled is *not* defined.
#
# Finally, version V' is ready.  And there is much rejoicing.  (And I
# have free time again.  I think.  Yeah, right.)

### Setup "GNU" style for perl-mode and cperl-mode.
## Local Variables:
## perl-indent-level: 2
## perl-continued-statement-offset: 2
## perl-continued-brace-offset: 0
## perl-brace-offset: 0
## perl-brace-imaginary-offset: 0
## perl-label-offset: -2
## cperl-indent-level: 2
## cperl-brace-offset: 0
## cperl-continued-brace-offset: 0
## cperl-label-offset: -2
## cperl-extra-newline-before-brace: t
## cperl-merge-trailing-else: nil
## cperl-continued-statement-offset: 2
## End:

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