Dear Users, I am experiencing a lot of issues in compiling my VC 2010 projects with a 64 bits machin (while they work happily witha 32 bits). I downloaded the 1_51 version of boost for 64bits and I obtained the following error with the serialization library: Error 495 error LNK1104: cannot open file 'libboost_serialization-vc100-mt-gd-1_51.lib Then I tried some older version ( 1_47, i ) but I received this series of compiling errors related again to the xml archive. Error 493 error LNK2019: unresolved external symbol "protected: __cdecl boost::archive::xml_oarchive_impl<class boost::archive::xml_oarchive>::xml_oarchive_impl<class boost::archive::xml_oarchive>(class std::basic_ostream<char,struct std::char_traits<char> > &,unsigned int)" ( ??0?$xml_oarchive_impl@Vxml_oarchive@archive@boost@@@archive@boost@@IEAA@AEAV?$basic_ostream@DU?$char_traits@D@std@@@std@@I@Z) referenced in function "public: __cdecl boost::archive::xml_oarchive::xml_oarchive(class std::basic_ostream<char,struct std::char_traits<char> > &,unsigned int)" ( ??0xml_oarchive@archive@boost@@QEAA@AEAV?$basic_ostream@DU?$char_traits@D@std@@@std@@I@Z ) Tried to build boost 1_51 with the 64bits using boostrap but it did not find build.bat since it is missing (I found boost-build.jam) Any suggestion?