MongoDB doesn't build with recent versions of boost (1.60 here), when using --use-system-boost because of changes in boost::optional. Indeed, boost::none_t is not default constructible anymore, so boost::none_t() doesn't compile anymore. See also: http://www.boost.org/doc/libs/release/boost/none.hpp

There are several options to work around this issue:

• use the boost::none constant
• use the more verbose {boost::none_t(boost::none_t::init_tag())}
• define {BOOST_OPTIONAL_USE_OLD_DEFINITION_OF_NONE}

  globally and continue using

  {boost::none_t()}

find -type f -iname '*.[ch]*' -exec sed -e "s/boost::none_t()/boost::none/" -i {} \;

seems to fix the issue.