I can't compile date_time using msvc 7.1. I think this problem is related to a bug with suffixes I found when I compiled filesysteem library. When I compile filesystem library with bbv2, I get boost_filesystem-vc71-1_33.dll instead of boost_filesystem-vc71-mt-1_33.dll I get with bbv1. When I use threading=multi switch I get boost_filesystem-vc71-mt-1_33.dll with bbv2 too. When I use threading=single switch I getboost_filesystem-vc71-1_33.dll It looks like threading=single is now set by default, but actual library is compiled with multithreaded library anyways because vc doesn't have a possibility to build with both threading=single and runtime-link=dynamic due to lack of this variant of RTL. Can anybody reproduce this bug and suggest how to fix it? I cannot fix it myself, because I don't know bbv2 well. Andrey