Hi, I noticed that boost/cstdint.h does not define int64_t when GCC is in strict mode (-ansi or -std=c++98) on MinGW, Cygwin, and probably other major platforms. This seems to be because boost/cstdint.h refuses to define the type if ULLONG_MAX (or ULONG_LONG_MAX or ULONGLONG_MAX) is not defined, even if BOOST_HAS_LONG_LONG is defined. GCC, quite correctly, will not define these macros in strict mode. However, the library still probably should be defining this type. Ideally, there would be a GCC-specific work-around to prevent warnings on the use of long long in strict mode. In particular, I am using the date_time library which depends on int64_t. It would be very unfortunate and a little silly if I could not use date_time in GCC's strict mode. How would it be best to fix this? Aaron