I'm trying to build my application with Visual Studio 2005 Beta 2 and I'm having the following horrilbe linking problems. I'm using Boost 1.32.0, which I've rebuilt with VS2005 using the vc-8_0 tools option. The errors are in 2 groups, "already defined" and unresolved external symbols. I don't get any errors or warnings with VS .Net 2003 7.1 compiler. Help! Thanks, Flavio. 1>Linking... 1>msvcprtd.lib(MSVCP80D.dll) : error LNK2005: "class std::basic_ostream<char,struct std::char_traits<char> > & __cdecl std::operator<<<char,struct std::char_traits<char>,class std::allocator<char> >(class std::basic_ostream<char,struct std::char_traits<char> > &,class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > const &)" (<mailto:??$?6DU?$char_traits@D@std@@V?$allocator@D@1@@std@@YAAAV?$basic_ostream@DU?$char_traits@D@std@@@0@AAV10@ABV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@0@@Z>??$?6DU?$char_traits@D@std@@V?$allocator@D@1@@std@@YAAAV?$basic_ostream@DU?$char_traits@D@std@@@0@AAV10@ABV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@0@@Z) already defined in libboost_serialization-vc71-mt-gd.lib(xml_oarchive.obj) 1>msvcprtd.lib(MSVCP80D.dll) : error LNK2005: "class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > __cdecl std::operator+<char,struct std::char_traits<char>,class std::allocator<char> >(class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > const &,char const *)" (<mailto:??$?HDU?$char_traits@D@std@@V?$allocator@D@1@@std@@YA?AV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@0@ABV10@PBD@Z>??$?HDU?$char_traits@D@std@@V?$allocator@D@1@@std@@YA?AV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@0@ABV10@PBD@Z) already defined in libboost_serialization-vc71-mt-gd.lib(xml_oarchive.obj) 1>msvcprtd.lib(MSVCP80D.dll) : error LNK2005: "class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > __cdecl std::operator+<char,struct std::char_traits<char>,class std::allocator<char> >(class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > const &,class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > const &)" (<mailto:??$?HDU?$char_traits@D@std@@V?$allocator@D@1@@std@@YA?AV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@0@ABV10@0@Z>??$?HDU?$char_traits@D@std@@V?$allocator@D@1@@std@@YA?AV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@0@ABV10@0@Z) already defined in libboost_serialization-vc71-mt-gd.lib(xml_oarchive.obj) 1>msvcprtd.lib(MSVCP80D.dll) : error LNK2005: "class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > __cdecl std::operator+<char,struct std::char_traits<char>,class std::allocator<char> >(char const *,class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > const &)" (<mailto:??$?HDU?$char_traits@D@std@@V?$allocator@D@1@@std@@YA?AV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@0@PBDABV10@@Z>??$?HDU?$char_traits@D@std@@V?$allocator@D@1@@std@@YA?AV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@0@PBDABV10@@Z) already defined in libboost_serialization-vc71-mt-gd.lib(xml_oarchive.obj) 1>msvcprtd.lib(MSVCP80D.dll) : error LNK2005: "public: __thiscall std::allocator<char>::allocator<char>(void)" (<mailto:??0?$allocator@D@std@@QAE@XZ>??0?$allocator@D@std@@QAE@XZ) already defined in libboost_serialization-vc71-mt-gd.lib(basic_text_oprimitive.obj) 1>msvcprtd.lib(MSVCP80D.dll) : error LNK2005: "public: __thiscall std::allocator<char>::allocator<char>(class std::allocator<char> const &)" (<mailto:??0?$allocator@D@std@@QAE@ABV01@@Z>??0?$allocator@D@std@@QAE@ABV01@@Z) already defined in libboost_serialization-vc71-mt-gd.lib(basic_text_oprimitive.obj) 1>msvcprtd.lib(MSVCP80D.dll) : error LNK2005: "public: unsigned int __thiscall std::allocator<char>::max_size(void)const " (<mailto:?max_size@?$allocator@D@std@@QBEIXZ>?max_size@?$allocator@D@std@@QBEIXZ) already defined in libboost_serialization-vc71-mt-gd.lib(basic_text_oprimitive.obj) 1>libboost_serialization-vc71-mt-gd.lib(basic_text_oprimitive.obj) : warning LNK4217: locally defined symbol <mailto:?_Addfac@_Locimp@locale@std@@AAEXPAVfacet@23@I@Z>?_Addfac@_Locimp@locale@std@@AAEXPAVfacet@23@I@Z (private: void __thiscall std::locale::_Locimp::_Addfac(class std::locale::facet *,unsigned int)) imported in function "public: __thiscall std::locale::locale<class boost::archive::codecvt_null<char> >(class std::locale const &,class boost::archive::codecvt_null<char> *)" (<mailto:??$?0V?$codecvt_null@D@archive@boost@@@locale@std@@QAE@ABV01@PAV?$codecvt_null@D@archive@boost@@@Z>??$?0V?$codecvt_null@D@archive@boost@@@locale@std@@QAE@ABV01@PAV?$codecvt_null@D@archive@boost@@@Z) 1>libboost_serialization-vc71-mt-gd.lib(basic_text_iprimitive.obj) : warning LNK4049: locally defined symbol <mailto:?_Addfac@_Locimp@locale@std@@AAEXPAVfacet@23@I@Z>?_Addfac@_Locimp@locale@std@@AAEXPAVfacet@23@I@Z (private: void __thiscall std::locale::_Locimp::_Addfac(class std::locale::facet *,unsigned int)) imported 1>libboost_serialization-vc71-mt-gd.lib(basic_text_oprimitive.obj) : warning LNK4217: locally defined symbol <mailto:??0_Locimp@locale@std@@AAE@ABV012@@Z>??0_Locimp@locale@std@@AAE@ABV012@@Z (private: __thiscall std::locale::_Locimp::_Locimp(class std::locale::_Locimp const &)) imported in function "public: __thiscall std::locale::locale<class boost::archive::codecvt_null<char> >(class std::locale const &,class boost::archive::codecvt_null<char> *)" (<mailto:??$?0V?$codecvt_null@D@archive@boost@@@locale@std@@QAE@ABV01@PAV?$codecvt_null@D@archive@boost@@@Z>??$?0V?$codecvt_null@D@archive@boost@@@locale@std@@QAE@ABV01@PAV?$codecvt_null@D@archive@boost@@@Z) 1>libboost_serialization-vc71-mt-gd.lib(basic_text_iprimitive.obj) : warning LNK4049: locally defined symbol <mailto:??0_Locimp@locale@std@@AAE@ABV012@@Z>??0_Locimp@locale@std@@AAE@ABV012@@Z (private: __thiscall std::locale::_Locimp::_Locimp(class std::locale::_Locimp const &)) imported 1>libboost_serialization-vc71-mt-gd.lib(basic_text_oprimitive.obj) : error LNK2019: unresolved external symbol <mailto:__imp_?_Xran@_String_base@std@@QBEXXZ>__imp_?_Xran@_String_base@std@@QBEXXZ referenced in function "public: class std::basic_string<char,struct std::char_traits<char>,class std::_DebugHeapAllocator<char> > & __thiscall std::basic_string<char,struct std::char_traits<char>,class std::_DebugHeapAllocator<char> >::assign(class std::basic_string<char,struct std::char_traits<char>,class std::_DebugHeapAllocator<char> > const &,unsigned int,unsigned int)" (<mailto:?assign@?$basic_string@DU?$char_traits@D@std@@V?$_DebugHeapAllocator@D@2@@std@@QAEAAV12@ABV12@II@Z>?assign@?$basic_string@DU?$char_traits@D@std@@V?$_DebugHeapAllocator@D@2@@std@@QAEAAV12@ABV12@II@Z) 1>libboost_serialization-vc71-mt-gd.lib(basic_text_iprimitive.obj) : error LNK2001: unresolved external symbol <mailto:__imp_?_Xran@_String_base@std@@QBEXXZ>__imp_?_Xran@_String_base@std@@QBEXXZ 1>libboost_serialization-vc71-mt-gd.lib(basic_text_oprimitive.obj) : error LNK2019: unresolved external symbol <mailto:__imp_?_Xlen@_String_base@std@@QBEXXZ>__imp_?_Xlen@_String_base@std@@QBEXXZ referenced in function "protected: bool __thiscall std::basic_string<char,struct std::char_traits<char>,class std::_DebugHeapAllocator<char> >::_Grow(unsigned int,bool)" (<mailto:?_Grow@?$basic_string@DU?$char_traits@D@std@@V?$_DebugHeapAllocator@D@2@@std@@IAE_NI_N@Z>?_Grow@?$basic_string@DU?$char_traits@D@std@@V?$_DebugHeapAllocator@D@2@@std@@IAE_NI_N@Z) 1>libboost_serialization-vc71-mt-gd.lib(basic_text_iprimitive.obj) : error LNK2001: unresolved external symbol <mailto:__imp_?_Xlen@_String_base@std@@QBEXXZ>__imp_?_Xlen@_String_base@std@@QBEXXZ 1>libboost_serialization-vc71-mt-gd.lib(xml_iarchive.obj) : error LNK2019: unresolved external symbol <mailto:__imp_?begin@?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@QAE?AViterator@12@XZ>__imp_?begin@?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@QAE?AViterator@12@XZ referenced in function "protected: void __thiscall boost::archive::basic_xml_iarchive<class boost::archive::xml_iarchive>::load_end(char const *)" (<mailto:?load_end@?$basic_xml_iarchive@Vxml_iarchive@archive@boost@@@archive@boost@@IAEXPBD@Z>?load_end@?$basic_xml_iarchive@Vxml_iarchive@archive@boost@@@archive@boost@@IAEXPBD@Z) 1>libboost_serialization-vc71-mt-gd.lib(xml_grammar.obj) : error LNK2001: unresolved external symbol <mailto:__imp_?begin@?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@QAE?AViterator@12@XZ>__imp_?begin@?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@QAE?AViterator@12@XZ 1>libboost_serialization-vc71-mt-gd.lib(xml_iarchive.obj) : error LNK2019: unresolved external symbol <mailto:__imp_?end@?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@QAE?AViterator@12@XZ>__imp_?end@?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@QAE?AViterator@12@XZ referenced in function "protected: void __thiscall boost::archive::basic_xml_iarchive<class boost::archive::xml_iarchive>::load_end(char const *)" (<mailto:?load_end@?$basic_xml_iarchive@Vxml_iarchive@archive@boost@@@archive@boost@@IAEXPBD@Z>?load_end@?$basic_xml_iarchive@Vxml_iarchive@archive@boost@@@archive@boost@@IAEXPBD@Z) 1>libboost_serialization-vc71-mt-gd.lib(xml_grammar.obj) : error LNK2001: unresolved external symbol <mailto:__imp_?end@?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@QAE?AViterator@12@XZ>__imp_?end@?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@QAE?AViterator@12@XZ 1>libboost_serialization-vc71-mt-gd.lib(xml_grammar.obj) : error LNK2019: unresolved external symbol <mailto:__imp_?append@?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@QAEAAV12@Vconst_iterator@12@0@Z>__imp_?append@?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@QAEAAV12@Vconst_iterator@12@0@Z referenced in function "public: void __thiscall boost::archive::`anonymous namespace'::append_string<class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> >,class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> >::const_iterator>::operator()(class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> >::const_iterator,class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> >::const_iterator)const " (<mailto:??R?$append_string@V?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@Vconst_iterator@12@@?A0x6748d6fd@archive@boost@@QBEXVconst_iterator@?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@0@Z>??R?$append_string@V?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@Vconst_iterator@12@@?A0x6748d6fd@archive@boost@@QBEXVconst_iterator@?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@0@Z)