!! FreeBSD13 で mpi4py をインストール

 # pkg install openmpi
 ## PATH=/usr/local/mpi/openmpi/bin:$PATH  ## を追加
 
 $ wget https://github.com/mpi4py/mpi4py/releases/download/3.1.3/mpi4py-3.1.3.tar.gz

 cd  mpi4py-3.1.3
 
 $  vi ./mpi.cfg
 [mpi]
 include_dirs         = /usr/local/mpi/openmpi/include
 libraries            = mpi 
 library_dirs         = /usr/local/mpi/openmpi/lib
 runtime_library_dirs = /usr/local/mpi/openmpi/lib

 python3.9 ./setup.py build