There are a set of macros in Boost.config that describe "features that are not required by the C++ standard" Some of these features have been incorporated into C++11. I propose that we retire these macros, and have people use the shiny C++11 versions. In particular: BOOST_HAS_STATIC_ASSERT should be ! BOOST_NO_CXX11_ASSERT BOOST_HAS_VARIADIC_TMPL should be ! BOOST_NO_CXX11_VARIADIC_TEMPLATES BOOST_HAS_RVALUE_REFS should be ! BOOST_NO_CXX11_RVALUE_REFERENCES BOOST_HAS_CHAR_16_T should be ! BOOST_NO_CXX11_CHAR_16_T BOOST_HAS_CHAR_32_T should be ! BOOST_NO_CXX11_CHAR_32_T I'm using "!" here generically; in code you would replace #ifdef OLD_MACRO with #ifndef NEW_MACRO etc. I don't think this will be very disruptive; very few boost libraries use these macros. Opinions? Other macros that fit into this group? -- Marshall Marshall Clow Idio Software <mailto:mclow.lists@gmail.com> A.D. 1517: Martin Luther nails his 95 Theses to the church door and is promptly moderated down to (-1, Flamebait). -- Yu Suzuki