Hello, I'm trying to compile Boost.MPI on a Cray XK6 machine. The MPI wrapper compiler is called `CC` and should be invoked with no particular options. However, Boost complains that `CC` is not known and does not compile Boost.MPI: MPI auto-detection failed: unknown wrapper compiler CC Please report this error to the Boost mailing list: http://www.boost.org You will need to manually configure MPI support. warning: skipping optional Message Passing Interface (MPI) library. note: to enable MPI support, add "using mpi ;" to user-config.jam. note: to suppress this message, pass "--without-mpi" to bjam. note: otherwise, you can safely ignore this message. I have added the following to the top-level `project-config.jam` file, but it does not help Jam to DTRT: using mpi : CC ; Any hints on how to proceed? Thanks, Riccardo