I have had success in installing Rmpi on Mavericks, and it may be helpful
to others:

I first installed *gfortran* and *open-mpi*:
brew install gfortran
brew install open-mpi

Then in R I installed Rmpi using this command:
*install.packages("Rmpi", type="source",
configure.args="with-mpi=/usr/local/opt/open-mpi")*

(The *configure.args* parameter got around the following error: "Cannot
find mpi.h header file".)

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