After a quick look at the documentation and user list messages I have found that using Boost.Python with msvc MTd or MT Runtime Libraries may have some problems. My first try with Boost.Python gave me this error:<br><br>c:\work\src\boost_1_43_0\boost/config/auto_link.hpp(297) : fatal error C1189: #error :  &quot;Mixing a dll boost library with a static runtime is a really bad idea...&quot;<br>
<br>Then I found that it was possible to use the BOOST_PYTHON_STATIC_LIB macro. This worked fine. I am using python 3.1, I have installed both the x86 and x64 python versions in different directories. Can someone explain me why I need to specify this macro and why &quot;Mixing a dll boost library with a static runtime is a really bad idea&quot;?<br>
<br>Regards,<br><br>Isaac Lascasas.<br>