[boost] [auto_link][thread] Including boost/thread/thread.hpp requires linking against date_time?

Hi In a Visual Studio 2008 project, when I include the trunk version of boost/thread/thread.hpp, it seems I must also link against the date_time library. When I build the same program with bjam, while not linking against date_time, the resulting program runs just fine. So my question is: Why does including thread.hpp require linking against the date_time library? It seems that it is not needed at all? Thanks & Regards, -- Andreas Huber When replying by private email, please remove the words spam and trap from the address shown in the header.