Dear Jonathan or any g++ programers: after reading your email hint, I goto my download and extracted directory /boost1_46_1/ directory and then run ./bootstrap.sh I don't know whether that is what you mean about ((install boost library) and (if it is where is boost library go)) then after that I run your suggest command in my cppcookbook/ directory which contain my example program about using boost lib's thread this is what I do and get ------------------------ eric@eric-laptop:~/cppcookbook$ g++ -I/home/eric/boost1/boost_1_46_1/ example12-1.cpp -L/home/eric/boost1/boost_1_46_1/boost/ -lboost_thread-mt /usr/bin/ld: cannot find -lboost_thread-mt collect2: ld returned 1 exit status eric@eric-laptop:~/cppcookbook$ ----------------------------------- would you please tell me what is boost_thread-mt mean? if that is a file, I indeed hard to find it in my /boost_1_46_1/ directory thanks your help a lot, but still not solve Eric
