libboost-mpi1.71.0 1.71.0-6ubuntu6 (riscv64 binary) in ubuntu focal

 This package forms part of the Boost C++ Libraries collection.
 .
 The Boost.MPI library provides a C++ interface to MPI that
 supports modern C++ development styles, including complete support for
 user-defined data types and C++ Standard Library types, arbitrary function
 objects for collective algorithms, and the use of modern C++ library
 techniques to maintain maximal efficiency.