I'm trying to run the exosome example with MPI but can't seem to get it to work.  I installed binaries both on Fedora 19 and Ubuntu Trusty.  I have openmpi on both and mpich on Fedora as well.  mpirun is in my path. 

Do I need to build with MPI mysefl for this to work or is this supposed to work with binaries out of the box?