Dear all, Trying the first example of the Boost.Serialization (A Very Simple Case): http://boost-sandbox.sourceforge.net/boost_1_43_0/libs/serialization/doc/tut... I get the error messages in the P.S. section with GCC 4.4.0 MinGW WinXP. Any ideas? TIA, --Hossein P.S. Compiling: main.cpp Linking console executable: bin\Debug\Serial.exe obj\Debug\main.o: In function `text_oarchive': /archive/text_oarchive.hpp:92: undefined reference to `boost::archive::text_oarchive_impl<boost::archive::text_oarchive>::text_oarchive_impl(std::ostream&, unsigned int)' obj\Debug\main.o: In function `text_iarchive': /archive/text_iarchive.hpp:129: undefined reference to `boost::archive::text_iarchive_impl<boost::archive::text_iarchive>::text_iarchive_impl(std::istream&, unsigned int)' /archive/text_iarchive.hpp:129: undefined reference to `boost::archive::detail::shared_ptr_helper::shared_ptr_helper()' obj\Debug\main.o: In function `~text_iarchive': /archive/text_iarchive.hpp:131: undefined reference to `boost::archive::detail::shared_ptr_helper::~shared_ptr_helper()' /archive/text_iarchive.hpp:131: undefined reference to `boost::archive::detail::shared_ptr_helper::~shared_ptr_helper()' obj\Debug\main.o: In function `~text_oarchive_impl': /archive/text_oarchive.hpp:77: undefined reference to `boost::archive::basic_text_oprimitive<std::ostream>::~basic_text_oprimitive()' /archive/text_oarchive.hpp:77: undefined reference to `boost::archive::basic_text_oprimitive<std::ostream>::~basic_text_oprimitive()' /archive/text_oarchive.hpp:77: undefined reference to `boost::archive::basic_text_oprimitive<std::ostream>::~basic_text_oprimitive()' /archive/text_oarchive.hpp:77: undefined reference to `boost::archive::basic_text_oprimitive<std::ostream>::~basic_text_oprimitive()' /archive/text_oarchive.hpp:77: undefined reference to `boost::archive::basic_text_oprimitive<std::ostream>::~basic_text_oprimitive()' obj\Debug\main.o: /archive/text_oarchive.hpp:77: more undefined references to `boost::archive::basic_text_oprimitive<std::ostream>::~basic_text_oprimitive()' follow obj\Debug\main.o: In function `~text_iarchive_impl': /archive/text_iarchive.hpp:80: undefined reference to `boost::archive::basic_text_iprimitive<std::istream>::~basic_text_iprimitive()' /archive/text_iarchive.hpp:80: undefined reference to `boost::archive::basic_text_iprimitive<std::istream>::~basic_text_iprimitive()' /archive/text_iarchive.hpp:80: undefined reference to `boost::archive::basic_text_iprimitive<std::istream>::~basic_text_iprimitive()' /archive/text_iarchive.hpp:80: undefined reference to `boost::archive::basic_text_iprimitive<std::istream>::~basic_text_iprimitive()' /archive/text_iarchive.hpp:80: undefined reference to `boost::archive::basic_text_iprimitive<std::istream>::~basic_text_iprimitive()' obj\Debug\main.o: /archive/text_iarchive.hpp:80: more undefined references to `boost::archive::basic_text_iprimitive<std::istream>::~basic_text_iprimitive()' follow obj\Debug\main.o: In function `~common_oarchive': archive/detail/common_oarchive.hpp:38: undefined reference to `boost::archive::detail::basic_oarchive::~basic_oarchive()' /archive/detail/common_oarchive.hpp:38: undefined reference to `boost::archive::detail::basic_oarchive::~basic_oarchive()' /archive/detail/common_oarchive.hpp:38: undefined reference to `boost::archive::detail::basic_oarchive::~basic_oarchive()' obj\Debug\main.o: In function `~common_iarchive': /archive/detail/common_iarchive.hpp:43: undefined reference to `boost::archive::detail::basic_iarchive::~basic_iarchive()' /archive/detail/common_iarchive.hpp:43: undefined reference to `boost::archive::detail::basic_iarchive::~basic_iarchive()' /archive/detail/common_iarchive.hpp:43: undefined reference to `boost::archive::detail::basic_iarchive::~basic_iarchive()' obj\Debug\main.o: /archive/detail/oserializer.hpp:253: undefined reference to `boost::archive::detail::basic_oarchive::save_object(void const*, boost::archive::detail::basic_oserializer const&)' obj\Debug\main.o: /archive/detail/iserializer.hpp:381: undefined reference to `boost::archive::detail::basic_iarchive::load_object(void*, boost::archive::detail::basic_iserializer const&)' obj\Debug\main.o: In function `oserializer': /archive/detail/oserializer.hpp:112: undefined reference to `boost::archive::detail::basic_oserializer::basic_oserializer(boost::serialization::extended_type_info const&)' obj\Debug\main.o: In function `~oserializer': /archive/detail/oserializer.hpp:133: undefined reference to `boost::archive::detail::basic_oserializer::~basic_oserializer()' /archive/detail/oserializer.hpp:133: undefined reference to `boost::archive::detail::basic_oserializer::~basic_oserializer()' /archive/detail/oserializer.hpp:133: undefined reference to `boost::archive::detail::basic_oserializer::~basic_oserializer()' obj\Debug\main.o: In function `iserializer': /archive/detail/iserializer.hpp:133: undefined reference to `boost::archive::detail::basic_iserializer::basic_iserializer(boost::serialization::extended_type_info const&)' obj\Debug\main.o: In function `~iserializer': /archive/detail/iserializer.hpp:158: undefined reference to `boost::archive::detail::basic_iserializer::~basic_iserializer()' /archive/detail/iserializer.hpp:158: undefined reference to `boost::archive::detail::basic_iserializer::~basic_iserializer()' /archive/detail/iserializer.hpp:158: undefined reference to `boost::archive::detail::basic_iserializer::~basic_iserializer()' obj\Debug\main.o: In function `extended_type_info_typeid': /serialization/extended_type_info_typeid.hpp:86: undefined reference to `boost::serialization::typeid_system::extended_type_info_typeid_0::extended_type_info_typeid_0(char const*)' /serialization/extended_type_info_typeid.hpp:88: undefined reference to `boost::serialization::typeid_system::extended_type_info_typeid_0::type_register(std::type_info const&)' /serialization/extended_type_info_typeid.hpp:89: undefined reference to `boost::serialization::extended_type_info::key_register() const' /serialization/extended_type_info_typeid.hpp:89: undefined reference to `boost::serialization::typeid_system::extended_type_info_typeid_0::~extended_type_info_typeid_0()' obj\Debug\main.o: In function `~extended_type_info_typeid': /serialization/extended_type_info_typeid.hpp:92: undefined reference to `boost::serialization::extended_type_info::key_unregister() const' /serialization/extended_type_info_typeid.hpp:93: undefined reference to `boost::serialization::typeid_system::extended_type_info_typeid_0::type_unregister()' /serialization/extended_type_info_typeid.hpp:93: undefined reference to `boost::serialization::typeid_system::extended_type_info_typeid_0::~extended_type_info_typeid_0()' /serialization/extended_type_info_typeid.hpp:93: undefined reference to `boost::serialization::typeid_system::extended_type_info_typeid_0::~extended_type_info_typeid_0()' /serialization/extended_type_info_typeid.hpp:92: undefined reference to `boost::serialization::extended_type_info::key_unregister() const' /serialization/extended_type_info_typeid.hpp:93: undefined reference to `boost::serialization::typeid_system::extended_type_info_typeid_0::type_unregister()' /serialization/extended_type_info_typeid.hpp:93: undefined reference to `boost::serialization::typeid_system::extended_type_info_typeid_0::~extended_type_info_typeid_0()' /serialization/extended_type_info_typeid.hpp:93: undefined reference to `boost::serialization::typeid_system::extended_type_info_typeid_0::~extended_type_info_typeid_0()' /serialization/extended_type_info_typeid.hpp:92: undefined reference to `boost::serialization::extended_type_info::key_unregister() const' /serialization/extended_type_info_typeid.hpp:93: undefined reference to `boost::serialization::typeid_system::extended_type_info_typeid_0::type_unregister()' /serialization/extended_type_info_typeid.hpp:93: undefined reference to `boost::serialization::typeid_system::extended_type_info_typeid_0::~extended_type_info_typeid_0()' /serialization/extended_type_info_typeid.hpp:93: undefined reference to `boost::serialization::typeid_system::extended_type_info_typeid_0::~extended_type_info_typeid_0()' obj\Debug\main.o:main.cpp:(.rdata$_ZTVN5boost13serialization6detail17singleton_wrapperINS0_25extended_type_info_typeidI12gps_positionEEEE[vtable for boost::serialization::detail::singleton_wrapper<boost::serialization::extended_type_info_typeid<gps_position> >]+0x8): undefined reference to `boost::serialization::typeid_system::extended_type_info_typeid_0::is_less_than(boost::serialization::extended_type_info const&) const' Process terminated with status 1 (0 minutes, 18 seconds) 50 errors, 0 warnings