Hi, I am trying to compile the boost thread that I found here: http://www-eleves-isia.cma.fr/documentation/BoostDoc/boost_1_29_0/libs/threa... But i get the following error: Can you please tell me what do i need to do to fix it? ./thread.o: In function `main':../thread.cpp:27: undefined reference to `boost::thread::thread(boost::function0<void, std::allocator<boost::function_base> > const&)' :../thread.cpp:28: undefined reference to `boost::thread::join()' :../thread.cpp:28: undefined reference to `boost::thread::~thread()' :../thread.cpp:28: undefined reference to `boost::thread::~thread()' ./thread.o: In function `thread_alarm::operator()()':../thread.cpp:11: undefined reference to `boost::xtime_get(boost::xtime*, int)' :../thread.cpp:14: undefined reference to `boost::thread::sleep(boost::xtime const&)' collect2: ld returned 1 exit status make: *** [sandbox] Error 1 make: Target `all' not remade because of errors. Build complete for project sandbox