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#!/usr/bin/perl -w
use strict;
use English;
open(my $config_file, '<', 'configure.ac')
or die "cannot open configure.ac: $!";
my $version = '';
my $found_init = 0;
while (<$config_file>)
{
if(/^AC_INIT\(GNU Emacs,\s*(\d+\.\d+(\.\d+)?)\s*\,.*/o)
{
$found_init and die 'found duplicate AC_INIT() in configure.ac';
$version = $1;
$found_init = 1;
}
}
$found_init or die 'no AC_INIT() found in configure.ac';
print "$version\n";
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