Hi everyone, i'm traying compile the example http://www.boost.org/doc/libs/1_42_0/doc/html/boost_asio/tutorial/tutdaytime..., but i getting this error, what i missing?? Thanks!! pp@hobbes:/home/pdro7/ns-Sockets# c++ -I ../boost_1_40_0 myserver.cpp -o myserver /usr/include/libboost_system.a /usr/include/libboost_thread.a /usr/include/libboost_date_time.a /usr/include/libboost_regex.a /usr/include/libboost_serialization.a -lpthread /usr/include/libboost_system.a(error_code.o): In function `boost::system::get_generic_category()': error_code.cpp:(.text+0x90): undefined reference to `__cxa_guard_acquire' error_code.cpp:(.text+0xaa): undefined reference to `__cxa_guard_release' /usr/include/libboost_system.a(error_code.o): In function `boost::system::get_system_category()': error_code.cpp:(.text+0x100): undefined reference to `__cxa_guard_acquire' error_code.cpp:(.text+0x11a): undefined reference to `__cxa_guard_release' /usr/include/libboost_system.a(error_code.o): In function `(anonymous namespace)::generic_error_category::message(int) const': error_code.cpp:(.text+0x176): undefined reference to `__cxa_guard_acquire' error_code.cpp:(.text+0x1eb): undefined reference to `__cxa_guard_release' error_code.cpp:(.text+0x231): undefined reference to `__cxa_guard_abort' /usr/include/libboost_system.a(error_code.o): In function `boost::system::errc::make_error_condition(boost::system::errc::errc_t)': error_code.cpp:(.text._ZN5boost6system4errc20make_error_conditionENS1_6errc_tE[boost::system::errc::make_error_condition(boost::system::errc::errc_t)]+0x38): undefined reference to `__cxa_guard_acquire' error_code.cpp:(.text._ZN5boost6system4errc20make_error_conditionENS1_6errc_tE[boost::system::errc::make_error_condition(boost::system::errc::errc_t)]+0x52): undefined reference to `__cxa_guard_release' collect2: ld returned 1 exit status -- Ing Pedro Alonso Chaparro Valero Ciudad Politecnica de la Innovación iTEAM - Mobile Communications Group Polytechnic University of Valencia C\ Camino de Vera S/N, Edificio 8G 46022 Valencia, Spain