Dear Jonathan and/or g++ with boost programer/users: I tried apt-get install libboost-dev on my ubuntu linux system but when I tried to compile/link ----------- eric@eric-laptop:~/cppcookbook$ g++ example12-1.cpp /tmp/cchm8bWZ.o: In function `main': example12-1.cpp:(.text+0x30): undefined reference to `boost::thread::join()' example12-1.cpp:(.text+0x3c): undefined reference to `boost::thread::~thread()' example12-1.cpp:(.text+0x5a): undefined reference to `boost::thread::~thread()' /tmp/cchm8bWZ.o: In function `boost::detail::thread_data_base::thread_data_base()': example12-1.cpp:(.text._ZN5boost6detail16thread_data_baseC2Ev[boost::detail::thread_data_base::thread_data_base()]+0x1b): undefined reference to `vtable for boost::detail::thread_data_base' /tmp/cchm8bWZ.o: In function `boost::thread::yield()': example12-1.cpp:(.text._ZN5boost6thread5yieldEv[boost::thread::yield()]+0x7): undefined reference to `boost::this_thread::yield()' /tmp/cchm8bWZ.o: In function `boost::thread::thread<MyThreadFunc>(MyThreadFunc, boost::disable_if<boost::is_convertible<MyThreadFunc&, boost::detail::thread_move_t<MyThreadFunc> >, boost::thread::dummy*>::type)': example12-1.cpp:(.text._ZN5boost6threadC1I12MyThreadFuncEET_NS_10disable_ifINS_14is_convertibleIRS3_NS_6detail13thread_move_tIS3_EEEEPNS0_5dummyEE4typeE[boost::thread::thread<MyThreadFunc>(MyThreadFunc, boost::disable_if<boost::is_convertible<MyThreadFunc&, boost::detail::thread_move_t<MyThreadFunc> >, boost::thread::dummy*>::type)]+0x21): undefined reference to `boost::thread::start_thread()' /tmp/cchm8bWZ.o: In function `boost::detail::thread_data<MyThreadFunc>::~thread_data()': example12-1.cpp:(.text._ZN5boost6detail11thread_dataI12MyThreadFuncED1Ev[boost::detail::thread_data<MyThreadFunc>::~thread_data()]+0x16): undefined reference to `boost::detail::thread_data_base::~thread_data_base()' /tmp/cchm8bWZ.o: In function `boost::detail::thread_data<MyThreadFunc>::~thread_data()': example12-1.cpp:(.text._ZN5boost6detail11thread_dataI12MyThreadFuncED0Ev[boost::detail::thread_data<MyThreadFunc>::~thread_data()]+0x16): undefined reference to `boost::detail::thread_data_base::~thread_data_base()' /tmp/cchm8bWZ.o:(.rodata._ZTIN5boost6detail11thread_dataI12MyThreadFuncEE[typeinfo for boost::detail::thread_data<MyThreadFunc>]+0x8): undefined reference to `typeinfo for boost::detail::thread_data_base' collect2: ld returned 1 exit status eric@eric-laptop:~/cppcookbook$ --------------------------------- actually I also tried to install that boost lib follow its install instuction , after that(maybe not fully success, I am not sure) I found there is libboost_thread.so -------- root@eric-laptop:/home/eric/boost1/boost_1_46_1# ls -l -a /usr/local/lib/libboost_thread.so lrwxrwxrwx 1 root root 25 2011-05-22 18:38 /usr/local/lib/libboost_thread.so -> libboost_thread.so.1.46.1 root@eric-laptop:/home/eric/boost1/boost_1_46_1# ls -l -a /usr/local/lib/libboost_thread.so.1.46.1 -rwxr-xr-x 1 root root 123301 2011-05-22 18:38 /usr/local/lib/libboost_thread.so.1.46.1 -------------- hope these help any advencer to debug to make it success to compile/link thanks a lot in advance, Eric