When simply including into C++ project and attempting to compile causes the following compile error: Environment: - Visual Studio 2010 Pro (Project Configuration: DLL project) - boost v1.60.0 C:\src\SDK\Boost\boost_1_60_0\boost_1_60_0\boost/date_time/microsec_time_clock.hpp(99): error C2146: syntax error : missing ';' before identifier 'curr' C:\src\SDK\Boost\boost_1_60_0\boost_1_60_0\boost/date_time/microsec_time_clock.hpp(81) : while compiling class template member function 'boost::posix_time::ptime boost::date_time::microsec_clock<time_type>::create_time(boost::date_time::microsec_clock<time_type>::time_converter)' with [ time_type=boost::posix_time::ptime ] C:\src\SDK\Boost\boost_1_60_0\boost_1_60_0\boost/thread/thread_time.hpp(22) : see reference to class template instantiation 'boost::date_time::microsec_clock<time_type>' being compiled with [ time_type=boost::posix_time::ptime ] C:\src\SDK\Boost\boost_1_60_0\boost_1_60_0\boost/date_time/microsec_time_clock.hpp(99): error C2065: 'curr' : undeclared identifier C:\src\SDK\Boost\boost_1_60_0\boost_1_60_0\boost/date_time/microsec_time_clock.hpp(100): error C2065: 'curr_ptr' : undeclared identifier C:\src\SDK\Boost\boost_1_60_0\boost_1_60_0\boost/date_time/microsec_time_clock.hpp(100): error C2065: 'curr' : undeclared identifier C:\src\SDK\Boost\boost_1_60_0\boost_1_60_0\boost/date_time/microsec_time_clock.hpp(101): error C2065: 'curr_ptr' : undeclared identifier C:\src\SDK\Boost\boost_1_60_0\boost_1_60_0\boost/date_time/microsec_time_clock.hpp(101): error C2227: left of '->tm_year' must point to class/struct/union/generic type type is ''unknown-type'' C:\src\SDK\Boost\boost_1_60_0\boost_1_60_0\boost/date_time/microsec_time_clock.hpp(102): error C2065: 'curr_ptr' : undeclared identifier C:\src\SDK\Boost\boost_1_60_0\boost_1_60_0\boost/date_time/microsec_time_clock.hpp(102): error C2227: left of '->tm_mon' must point to class/struct/union/generic type type is ''unknown-type'' C:\src\SDK\Boost\boost_1_60_0\boost_1_60_0\boost/date_time/microsec_time_clock.hpp(103): error C2065: 'curr_ptr' : undeclared identifier C:\src\SDK\Boost\boost_1_60_0\boost_1_60_0\boost/date_time/microsec_time_clock.hpp(103): error C2227: left of '->tm_mday' must point to class/struct/union/generic type type is ''unknown-type'' C:\src\SDK\Boost\boost_1_60_0\boost_1_60_0\boost/date_time/microsec_time_clock.hpp(111): error C2065: 'curr_ptr' : undeclared identifier C:\src\SDK\Boost\boost_1_60_0\boost_1_60_0\boost/date_time/microsec_time_clock.hpp(111): error C2227: left of '->tm_hour' must point to class/struct/union/generic type type is ''unknown-type'' C:\src\SDK\Boost\boost_1_60_0\boost_1_60_0\boost/date_time/microsec_time_clock.hpp(112): error C2065: 'curr_ptr' : undeclared identifier C:\src\SDK\Boost\boost_1_60_0\boost_1_60_0\boost/date_time/microsec_time_clock.hpp(112): error C2227: left of '->tm_min' must point to class/struct/union/generic type type is ''unknown-type'' C:\src\SDK\Boost\boost_1_60_0\boost_1_60_0\boost/date_time/microsec_time_clock.hpp(113): error C2065: 'curr_ptr' : undeclared identifier C:\src\SDK\Boost\boost_1_60_0\boost_1_60_0\boost/date_time/microsec_time_clock.hpp(113): error C2227: left of '->tm_sec' must point to class/struct/union/generic type type is ''unknown-type''