The first few lines of suffix.hpp currently look like this: #include <limits.h> # if !defined(BOOST_HAS_LONG_LONG) \ && !defined(BOOST_MSVC) && !defined(__BORLANDC__) \ && (defined(ULLONG_MAX) || defined(ULONG_LONG_MAX) || defined(ULONGLONG_MAX)) # define BOOST_HAS_LONG_LONG #endif What is the reason for this code being there? Isn't it enough to test for this in the platform/compiler/stdlib config? I'm asking this question because currently stdlib/libstdcpp3.hpp explicitely turns off BOOST_HAS_LONG_LONG when the library indicates that there is no support for long long, and this is foiled by the code in suffix.hpp, which turns on BOOST_HAS_LONG_LONG again. (And this causes errors with gcc-3.3.x on Tru64.) Maybe we need two config macros for this? One for BOOST_COMPILER_HAS_LONG_LONG, and one for BOOST_STDLIB_HAS_LONG_LONG? Comments or thoughts, anyone? Markus