id summary reporter owner description type status milestone component version severity resolution keywords cc 2593 asio missing IPPROTO_IPV6 for win2k and older targets Joey Liaw chris_kohlhoff "When building against Vista SDK headers, if the windows version target _WIN32_WINNT is defined to be 0x0500 (win2k) or less, IPPROTO_IPV6 is not included in the enum in ws2def.h, giving the error: boost/asio/detail/socket_ops.hpp(407) : error C2065: 'IPPROTO_IPV6' : undeclared identifier Since this is the only header which references IPPROTO_IPV6, a possible workaround would be to stick at the top of the header: // When target is Windows 2000 or earlier, Microsoft's ws2def.h does not // enumerate IPPROTO_IPV6. #if defined(BOOST_WINDOWS) || defined(__CYGWIN__) # if defined(_WIN32_WINNT) && (_WIN32_WINNT <= 0x0500) # define IPPROTO_IPV6 41 # endif // _WIN32_WINNT #endif // defined(BOOST_WINDOWS) || defined(__CYGWIN__) " Bugs closed Boost 1.38.0 asio Boost 1.37.0 Problem invalid IPPROTO_IPV6