This FTBFS was fixed in Ubuntu by adding docbook-xml to build-dependencies. See https://bugs.launchpad.net/bugs/586918
Because upstream now depends on docbook-xml: http://www.opensource-archive.org/archive/index.php/t-135468.html -- To UNSUBSCRIBE, email to debian-bugs-rc-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org