Older versions of Boost have issues with C++11 due to boost::shared_ptr.
Details:
http://stackoverflow.com/questions/
18900730/boostshared-ptrshared-ptrconst-boostshared-ptr-is-implicitly-declared
https://svn.boost.org/trac/boost/changeset/73202
This seems to have been fixed in Boost 1.48 (untested, though).
This closes bug #593.