some URLs are 404 not found
<?xml version="1.0"?>
<catalog xmlns="urn:oasis:names:tc:entity:xmlns:xml:catalog" prefer="public">
<public publicId="-//freedesktop//DTD D-BUS Object Introspection 1.0//EN" uri="/nix/store/29n5vxmqjfy4qips1x66hq6y2m9q0qlp-dbus-1.14.8/share/xml/dbus-1/introspect.dtd"/>
<system systemId="http://www.freedesktop.org/standards/dbus/1.0/introspect.dtd" uri="/nix/store/29n5vxmqjfy4qips1x66hq6y2m9q0qlp-dbus-1.14.8/share/xml/dbus-1/introspect.dtd"/>
<public publicId="-//freedesktop//DTD D-BUS Bus Configuration 1.0//EN" uri="/nix/store/29n5vxmqjfy4qips1x66hq6y2m9q0qlp-dbus-1.14.8/share/xml/dbus-1/busconfig.dtd"/>
<system systemId="http://www.freedesktop.org/standards/dbus/1.0/busconfig.dtd" uri="/nix/store/29n5vxmqjfy4qips1x66hq6y2m9q0qlp-dbus-1.14.8/share/xml/dbus-1/busconfig.dtd"/>
</catalog>
http://www.freedesktop.org/standards/dbus/1.0/busconfig.dtd and http://www.freedesktop.org/standards/dbus/1.0/introspect.dtd are 404.