Hi Guys I am try to create a thread with boost but eveytime I execute I get some freaky error messages. See code below followed by error msg: #include <boost/thread/thread.hpp> #include <iostream> using namespace std; void hello() { cout << "hello" << endl; } int main(int argc, char* argv[]) { boost::thread thrd1(&hello); // ERROR caused by the &hello param thrd1.join(); } *Error Message*: /tmp/cc3ymRwv.o: In function `main': main.cc:(.text+0x417): undefined reference to `boost::thread::join()' main.cc:(.text+0x422): undefined reference to `boost::thread::~thread()' main.cc:(.text+0x43b): undefined reference to `boost::thread::~thread()' /tmp/cc3ymRwv.o: In function `boost::mutex::mutex()': main.cc:(.text._ZN5boost5mutexC1Ev[boost::mutex::mutex()]+0x45): undefined reference to `boost::thread_resource_error::thread_resource_error()' main.cc:(.text._ZN5boost5mutexC1Ev[boost::mutex::mutex()]+0x4d): undefined reference to `boost::thread_resource_error::~thread_resource_error()' main.cc:(.text._ZN5boost5mutexC1Ev[boost::mutex::mutex()]+0x55): undefined reference to `typeinfo for boost::thread_resource_error' /tmp/cc3ymRwv.o: In function `boost::detail::thread_data<void (*)()>::~thread_data()': main.cc:(.text._ZN5boost6detail11thread_dataIPFvvEED0Ev[boost::detail::thread_data<void (*)()>::~thread_data()]+0x16): undefined reference to `boost::detail::thread_data_base::~thread_data_base()' /tmp/cc3ymRwv.o: In function `boost::detail::thread_data<void (*)()>::~thread_data()': main.cc:(.text._ZN5boost6detail11thread_dataIPFvvEED1Ev[boost::detail::thread_data<void (*)()>::~thread_data()]+0x16): undefined reference to `boost::detail::thread_data_base::~thread_data_base()' /tmp/cc3ymRwv.o: In function `boost::condition_variable::condition_variable()': main.cc:(.text._ZN5boost18condition_variableC1Ev[boost::condition_variable::condition_variable()]+0x3a): undefined reference to `boost::thread_resource_error::thread_resource_error()' main.cc:(.text._ZN5boost18condition_variableC1Ev[boost::condition_variable::condition_variable()]+0x42): undefined reference to `boost::thread_resource_error::~thread_resource_error()' main.cc:(.text._ZN5boost18condition_variableC1Ev[boost::condition_variable::condition_variable()]+0x4a): undefined reference to `typeinfo for boost::thread_resource_error' /tmp/cc3ymRwv.o: In function `boost::detail::thread_data_base::thread_data_base()': main.cc:(.text._ZN5boost6detail16thread_data_baseC2Ev[boost::detail::thread_data_base::thread_data_base()]+0x1b): undefined reference to `vtable for boost::detail::thread_data_base' /tmp/cc3ymRwv.o: In function `boost::thread::thread<void (*)()>(void (*)(), boost::disable_if<boost::is_convertible<void (*&)(), boost::detail::thread_move_t<void (*)()> >, boost::thread::dummy*>::type)': main.cc:(.text._ZN5boost6threadC1IPFvvEEET_NS_10disable_ifINS_14is_convertibleIRS4_NS_6detail13thread_move_tIS4_EEEEPNS0_5dummyEE4typeE[boost::thread::thread<void (*)()>(void (*)(), boost::disable_if<boost::is_convertible<void (*&)(), boost::detail::thread_move_t<void (*)()> >, boost::thread::dummy*>::type)]+0x32): undefined reference to `boost::thread::start_thread()' /tmp/cc3ymRwv.o:(.rodata._ZTIN5boost6detail11thread_dataIPFvvEEE[typeinfo for boost::detail::thread_data<void (*)()>]+0x8): undefined reference to `typeinfo for boost::detail::thread_data_base' collect2: ld returned 1 exit status