Linux build: Use sysroot when calculating dependencies

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

+# Copyright © 2006 Frank Lichtenheld <djpig@debian.org>
+# Copyright © 2007,2012 Guillem Jover <guillem@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::Package;
+
+use strict;
+use warnings;
+
+our $VERSION = '0.01';
+
+use Dpkg::Gettext;
+
+use Exporter qw(import);
+our @EXPORT = qw(pkg_name_is_illegal);
+
+sub pkg_name_is_illegal($) {
+    my $name = shift || '';
+
+    if ($name eq '') {
+        return _g('may not be empty string');
+    }
+    if ($name =~ m/[^-+.0-9a-z]/o) {
+        return sprintf(_g("character '%s' not allowed"), $&);
+    }
+    if ($name !~ m/^[0-9a-z]/o) {
+        return _g('must start with an alphanumeric character');
+    }
+
+    return;
+}
+
+1;