[boost] [geometry] Documentation building

I'm working on CMake'fication of boost libraries, and i 've got issue when building documentation of Boost.Geometry. This library uses doxygen_xml2qbk utility for convertiong doxygen XML to quickbook, and this utility uses RapidXML for xml processing. I found rapidxml in Boost.PropertyTree library, but it is in detail subdirectory and also have different namespaces (`boost::property_tree::detail::rapidxml` vs `rapidxml`) Can i use rapidxml from PropertyTree library, or i must write CMake script for searching rapidxml as thirdparty library?