Dear Jeffrey (and/or gnu/g++ programers): I follow your hint -------------------- root@eric-laptop:/# ldconfig -p | grep -i boost root@eric-laptop:/# ---------- so it looks my thread lib is not available for the runtime linker although your first commnad do issue a.out without compile/link error however, when I run ./a.out --------- eric@eric-laptop:~/cppcookbook$ ./a.out ./a.out: error while loading shared libraries: libboost_thread.so.1.46.1: cannot open shared object file: No such file or directory -- that looks not what the book author suppose it be. (so I emailed first author of that book, D. Ryan Stephens, he is not yet reply me) looking to see better way to make it work right, and thanks a lot in advance, Eric
