+=item package_tracking_domain $gPackageTrackingDomain
+
+Domain where the package pages are kept; links should work in a
+package_tracking_domain/foopackage manner. Defaults to undef, which means that
+package links will not be made. Should be prefixed with the appropriate protocol
+(http or https).
+
+=cut
+
+set_default(\%config,'package_tracking_domain',undef);
+