Add in default rule for xml files. This allows packaging of the single-file form of the Docbook manual, and the single-file form of the Doxygen API reference. I've put up the compressed files here: ftp://gcc.gnu.org/pub/libstdc++/doxygen/libstdc++-api.20100719.xml.bz2 ftp://gcc.gnu.org/pub/libstdc++/doxygen/libstdc++-manual.20100719.xml.bz2 -benjamin