/usr/share/perl5/Debian/Debhelper/Sequence/autoreconf.pm is in dh-autoreconf 5ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 | #!/usr/bin/perl
use warnings;
use strict;
use Debian::Debhelper::Dh_Lib;
insert_before("dh_auto_configure", "dh_autoreconf");
insert_before("dh_clean", "dh_autoreconf_clean");
1;
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