Linux build: Use sysroot when calculating dependencies

third_party/dpkg-dev/scripts/Dpkg/Vars.pm

+# Copyright © 2007-2009,2012-2013 Guillem Jover <guillem@debian.org>
+# Copyright © 2007 Raphaël Hertzog <hertzog@debian.org>
+#
+# 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 of the License, 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, see <https://www.gnu.org/licenses/>.
+
+package Dpkg::Vars;
+
+use strict;
+use warnings;
+
+our $VERSION = '0.03';
+
+use Dpkg::ErrorHandling;
+use Dpkg::Gettext;
+use Dpkg::Package;
+
+use Exporter qw(import);
+our @EXPORT = qw(get_source_package set_source_package);
+
+my $sourcepackage;
+
+sub get_source_package {
+    return $sourcepackage;
+}
+
+sub set_source_package {
+    my $v = shift;
+    my $err = pkg_name_is_illegal($v);
+    error(_g("source package name '%s' is illegal: %s"), $v, $err) if $err;
+
+    if (not defined($sourcepackage)) {
+        $sourcepackage = $v;
+    } elsif ($v ne $sourcepackage) {
+        error(_g('source package has two conflicting values - %s and %s'),
+              $sourcepackage, $v);
+    }
+}
+
+1;