Hi All: I have installed boost lib also including mpi. I am trying to run some simple mpi program to test it. my program: (test_p2p.cpp)------------------------------------------------------- #include <boost/mpi/environment.hpp>#include <boost/mpi/communicator.hpp>#include <iostream>namespace mpi = boost::mpi; int main(int argc, char* argv[]) { mpi::environment env(argc, argv); mpi::communicator world; std::cout << "I am process " << world.rank() << " of " << world.size() << "." << std::endl; return 0;}-------------------------------------------------------- my compile command: g++ -o testp2p test_p2p.cpp I got error : /boost/mpi/environment.hpp:16:32: error: boost/mpi/config.hpp: No such file or directory But , I have checked the directory: boost/mpi/, it actually have config.hpp. I have added the path for these files into my PATHPATH=/home/myfolder/boost_2010_6_8/boost_1_43_0 also LD_LIBRARY_PATH=/home/myfolder/boost_2010_6_8/boost_1_43_0 why I still have this error. Any help is really appreciated. thanks Jack June 9 2010 _________________________________________________________________ The New Busy is not the too busy. Combine all your e-mail accounts with Hotmail. http://www.windowslive.com/campaign/thenewbusy?tile=multiaccount&ocid=PID28326::T:WLMTAGL:ON:WL:en-US:WM_HMP:042010_4