You need to use mpicc as the C compiler and linker. That will take  
care of passing whatever flags are needed for proper compilation and  
linking. You can pass it to ocaml with:

ocamlc -cc mpicc -o testmpi unix.cma mpi.cma test.ml -ccopt -L.



Andres


On Sep 17, 2007, at 5:08 PM, Rod wrote:

> 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
>
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