[boost] [ratio] clang warning

Ratio gives a warning under Clang: ..\..\..\include/boost/ratio/ratio_fwd.hpp:87:58: warning: 'long long' is a C++11 extension [-Wc++11-long-long] typedef ratio exa; ^ ..\..\..\include/boost/ratio/config.hpp:47:33: note: expanded from macro 'BOOST_RATIO_INTMAX_C' #define BOOST_RATIO_INTMAX_C(a) INTMAX_C(a) ^ ..\..\..\include/boost/cstdint.hpp:66:26: note: expanded from macro 'INTMAX_C' # define INTMAX_C(c) c##LL ^ I'm not sure how this can be avoided though.