echo "SYSTEM \"/usr/share/docbook/docbookx.dtd\" \ \"/usr/share/xml/docbook/xml-dtd-&DocBook-version;/docbookx.dtd\"" >> \ /usr/share/sgml/openjade-&openjade-version;/catalog This configuration is only necessary if you intend to use OpenJade to process the BLFS XML files through DSSSL Stylesheets.