<*.ml>: use_mpi, use_extLib
<kind.{byte,native}>: use_unix, use_str, use_mpi
<kind_invariant.{byte,native}> or <kind.{byte,native}>: use_unix, use_str, use_mpi, use_extLib
<pkind_main.{byte,native}> or <pkind.{byte,native}>: use_unix, use_str, use_mpi, use_extLib
