hello, #include <iostream> #include <algorithm> int main() { const double d = std::max(5.0, 6.0); return 0; } This works fine. <algorithm> is supposed to be included to use the max algorithm. <algorithm> comes with VisualC++ headers, which intel uses. The strange thing is that when adding #include <boost/date_time/posix_time/posix_time.hpp> before or after <algorithm> #include <iostream> #include <algorithm> #include <boost/date_time/posix_time/posix_time.hpp> int main() { const double d = std::max(5.0, 6.0); return 0; } 1>.\main.cpp(9): error: expected an identifier 1> const double d = std::max(5.0, 6.0); 1> ^ 1> 1>.\main.cpp(9): error: expected an identifier 1> const double d = std::max(5.0, 6.0); Inclusing of that header seems somehow to damage "max". Gcc4.1/boost doesn't have this problem. any ideas, rds,