Hi there, I am using boost::thread for the first time as part of boost::asio. I am trying to compile the chat_client.cpp example. When I uncomment the threading line, it won't link. Here's the line in question: boost::thread t(boost::bind(&boost::asio::io_service::run, &io_service)); and heres the error: chat_client.obj : error LNK2019: unresolved external symbol "public: __thiscall boost::thread::~thread(void)" (??1thread@boost@@QAE@XZ) referenced in function _main chat_client.obj : error LNK2019: unresolved external symbol "public: void __thiscall boost::thread::join(void)" (?join@thread@boost@@QAEXXZ) referenced in function _main chat_client.obj : error LNK2019: unresolved external symbol "public: __thiscall boost::thread::thread(class boost::function0<void,class std::allocator<class boost::function_base> > const &)" (??0thread@boost@@QAE@ABV?$function0@XV?$allocator@Vfunction_base@boost@@@std@@@1@@Z) referenced in function _main I think I've done everything required. I've installed all the boost libraries with the Boost Consulting installer. I've added a few defines too: #define BOOST_ALL_NO_LIB // For linking with boost.thread not supported by BOOST_ALL_DYN_LINK #define BOOST_THREAD_USE_DLL // Verbose #define BOOST_LIB_DIAGNOSTIC All to no avail. I'm not getting the 'boost-*.lib not found' message..... Just missing functions! Anyone any advice? Thanks Simon _________________________________________________________________ Play your part in making history - Email Britain! http://www.emailbritain.co.uk/