Hi, _M_X64 (MSVC typedef for AMD64/Intel EM64T) is missing from the list of little endian platforms in detail/endian.hpp. Could someone please apply the attached patch? Regards, Stephan Index: boost/detail/endian.hpp =================================================================== RCS file: /cvsroot/boost/boost/boost/detail/endian.hpp,v retrieving revision 1.2 diff -u -r1.2 endian.hpp --- boost/detail/endian.hpp 19 Jul 2005 23:44:52 -0000 1.2 +++ boost/detail/endian.hpp 22 Sep 2006 16:52:29 -0000 @@ -47,7 +47,7 @@ #elif defined(__i386__) || defined(__alpha__) \ || defined(__ia64) || defined(__ia64__) \ || defined(_M_IX86) || defined(_M_IA64) \ - || defined(_M_ALPHA) + || defined(_M_ALPHA) || defined(_M_X64) # define BOOST_LITTLE_ENDIAN # define BOOST_BYTE_ORDER 1234 #else