Dear, Sorry for replying to a specific person since the reply link is not operational for me(at least). g++ -c -I/usr/local/include/boost-1_33_1 filename.cc -c option only creates the linkable object file(correct me if I am mistaken so you have link some libraries to get the proper exe file(I am under XP now)) but -c option does not call the linker. I have chosen both boost and boost devel packages for install under Cygwin. I was using the same code under linux with the following link options g++ -g -o filename filename.cc -I/usr/local/opt/boost_1_33_1/include/boost-1_33_1/ -L/usr/local/opt/boost-1_33_1/lib -lboost_filesystem-gcc So I was linking to the boost_filesystem-gcc library. I tried the same but it gave errors, Regards,