See http://svn.boost.org/svn/boost/branches/cpp0x This branch adds the following config macros: BOOST_NO_CHAR16_T BOOST_NO_CHAR32_T BOOST_NO_CONSTEXPR BOOST_NO_DECLTYPE BOOST_NO_DEFAULTED_FUNCTIONS BOOST_NO_DELETED_FUNCTIONS BOOST_NO_EXPLICIT_CONVERSION_OPERATORS BOOST_NO_EXTERN_TEMPLATE BOOST_NO_RAW_LITERALS BOOST_NO_RVALUE_REFERENCES BOOST_NO_SCOPED_ENUMS BOOST_NO_STATIC_ASSERT BOOST_NO_UNICODE_LITERALS BOOST_NO_VARIADIC_TEMPLATES The particular names were discussed in several threads nearly a year ago. The set of C++0x features detected only covers those available in at least one shipping compiler. Although I've tested locally, I'd appreciate it if someone familiar with Boost.Config could take a look at the branch before the config directories get merged into trunk. --Beman