/usr/bin/dh_update_autotools_config is in debhelper 9.20160115ubuntu3.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 | #!/usr/bin/perl
=head1 NAME
dh_update_autotools_config  - Update autotools config files
=cut
use strict;
use warnings;
use Debian::Debhelper::Dh_Lib;
=head1 SYNOPSIS
B<dh_update_autotools_config> [S<I<debhelper options>>]
=head1 DESCRIPTION
B<dh_update_autotools_config> replaces all occurrences of B<config.sub>
and B<config.guess> in the source tree by the up-to-date versions
found in the autotools-dev package.  The original files are backed up
and restored by B<dh_clean>.
=cut
init();
for my $basename (qw(config.guess config.sub)) {
	my $new_version = "/usr/share/misc/$basename";
	open(my $fd, '-|', 'find', '-mindepth', '1',
		 '(', '-type', 'd', '-name', '.*', '-prune', ')',
		 '-o', '-type', 'f', '-name', $basename, '-print')
		or error("Cannot run find -type f -name $basename: $!");
	while (my $filename = <$fd>) {
		chomp($filename);
		next if not is_autotools_config_file($filename);
		restore_file_on_clean($filename);
		doit('cp', '-f', $new_version, $filename);
	}
	close($fd);
}
sub is_autotools_config_file {
	my ($file) = @_;
	my ($saw_timestamp);
	open(my $fd, '<', $file) or error("open $file for reading failed: $!");
	while (my $line = <$fd>) {
		chomp($line);
		# This is the test lintian uses.
		if ($line =~ m{^timestamp=['"]\d{4}-\d{2}-\d{2}['"]\s*$}) {
			$saw_timestamp = 1;
			last;
		}
		last if $. >= 10;
	}
	close($fd);
	return $saw_timestamp;
}
=head1 SEE ALSO
L<debhelper(7)>
This program is a part of debhelper.
=head1 AUTHOR
Niels Thykier <niels@thykier.net>
=cut
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