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diff --git a/scripts/Dpkg/Deps/Union.pm b/scripts/Dpkg/Deps/Union.pm
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+# Copyright © 1998 Richard Braakman
+# Copyright © 1999 Darren Benham
+# Copyright © 2000 Sean 'Shaleh' Perry
+# Copyright © 2004 Frank Lichtenheld
+# Copyright © 2006 Russ Allbery
+# Copyright © 2007-2009 Raphaël Hertzog <hertzog@debian.org>
+# Copyright © 2008-2009, 2012-2014 Guillem Jover <guillem@debian.org>
+#
+# This program is free software; you may 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 of the License, or
+# (at your option) any later version.
+#
+# This 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, see <https://www.gnu.org/licenses/>.
+
+package Dpkg::Deps::Union;
+
+=encoding utf8
+
+=head1 NAME
+
+Dpkg::Deps::Union - list of unrelated dependencies
+
+=head1 DESCRIPTION
+
+This class represents a list of relationships.
+It inherits from Dpkg::Deps::Multiple.
+
+=cut
+
+use strict;
+use warnings;
+
+our $VERSION = '1.00';
+
+use parent qw(Dpkg::Deps::Multiple);
+
+=head1 METHODS
+
+=over 4
+
+=item $dep->output([$fh])
+
+The output method uses ", " to join the list of relationships.
+
+=cut
+
+sub output {
+    my ($self, $fh) = @_;
+
+    my $res = join(', ', map {
+        $_->output()
+    } grep {
+        not $_->is_empty()
+    } $self->get_deps());
+
+    if (defined $fh) {
+        print { $fh } $res;
+    }
+    return $res;
+}
+
+=item $dep->implies($other_dep)
+
+=item $dep->get_evaluation($other_dep)
+
+These methods are not meaningful for this object and always return undef.
+
+=cut
+
+sub implies {
+    # Implication test is not useful on Union.
+    return;
+}
+
+sub get_evaluation {
+    # Evaluation is not useful on Union.
+    return;
+}
+
+=item $dep->simplify_deps($facts)
+
+The simplification is done to generate an union of all the relationships.
+It uses $simple_dep->merge_union($other_dep) to get its job done.
+
+=cut
+
+sub simplify_deps {
+    my ($self, $facts) = @_;
+    my @new;
+
+WHILELOOP:
+    while (@{$self->{list}}) {
+        my $odep = shift @{$self->{list}};
+        foreach my $dep (@new) {
+            next WHILELOOP if $dep->merge_union($odep);
+        }
+        push @new, $odep;
+    }
+    $self->{list} = [ @new ];
+}
+
+=back
+
+=head1 CHANGES
+
+=head2 Version 1.00 (dpkg 1.15.6)
+
+Mark the module as public.
+
+=cut
+
+1;