Hi all, I'm trying to compile the test file using ocamlmpi, but just what I have is this message ------------------------------------------------------------------------------- ocamlc -o testmpi unix.cma mpi.cma test.ml -ccopt -L. File "test.ml", line 144, characters 6-9: Warning Y: unused variable res. /usr/bin/ld: cannot find -lmpi collect2: ld returned 1 exit status Error while building custom runtime system ----------------------------------------------------------------------------- I'm using mpich2-1.0.5p4. Thanks in advance for any answer. Cheer, Rodiney