/usr/include/boost/mpi/ is in libboost1.62-dev 1.62.0+dfsg-5.
This file is owned by root:root, with mode 0o755.
..
/usr/include/boost/mpi/allocator.hpp
/usr/include/boost/mpi/collectives/
/usr/include/boost/mpi/collectives.hpp
/usr/include/boost/mpi/collectives/all_gather.hpp
/usr/include/boost/mpi/collectives/all_reduce.hpp
/usr/include/boost/mpi/collectives/all_to_all.hpp
/usr/include/boost/mpi/collectives/broadcast.hpp
/usr/include/boost/mpi/collectives/gather.hpp
/usr/include/boost/mpi/collectives/gatherv.hpp
/usr/include/boost/mpi/collectives/reduce.hpp
/usr/include/boost/mpi/collectives/scan.hpp
/usr/include/boost/mpi/collectives/scatter.hpp
/usr/include/boost/mpi/collectives/scatterv.hpp
/usr/include/boost/mpi/collectives_fwd.hpp
/usr/include/boost/mpi/communicator.hpp
/usr/include/boost/mpi/config.hpp
/usr/include/boost/mpi/datatype.hpp
/usr/include/boost/mpi/datatype_fwd.hpp
/usr/include/boost/mpi/detail/
/usr/include/boost/mpi/detail/binary_buffer_iprimitive.hpp
/usr/include/boost/mpi/detail/binary_buffer_oprimitive.hpp
/usr/include/boost/mpi/detail/broadcast_sc.hpp
/usr/include/boost/mpi/detail/communicator_sc.hpp
/usr/include/boost/mpi/detail/computation_tree.hpp
/usr/include/boost/mpi/detail/content_oarchive.hpp
/usr/include/boost/mpi/detail/forward_iprimitive.hpp
/usr/include/boost/mpi/detail/forward_oprimitive.hpp
/usr/include/boost/mpi/detail/forward_skeleton_iarchive.hpp
/usr/include/boost/mpi/detail/forward_skeleton_oarchive.hpp
/usr/include/boost/mpi/detail/ignore_iprimitive.hpp
/usr/include/boost/mpi/detail/ignore_oprimitive.hpp
/usr/include/boost/mpi/detail/ignore_skeleton_oarchive.hpp
/usr/include/boost/mpi/detail/mpi_datatype_cache.hpp
/usr/include/boost/mpi/detail/mpi_datatype_oarchive.hpp
/usr/include/boost/mpi/detail/mpi_datatype_primitive.hpp
/usr/include/boost/mpi/detail/packed_iprimitive.hpp
/usr/include/boost/mpi/detail/packed_oprimitive.hpp
/usr/include/boost/mpi/detail/point_to_point.hpp
/usr/include/boost/mpi/detail/text_skeleton_oarchive.hpp
/usr/include/boost/mpi/environment.hpp
/usr/include/boost/mpi/exception.hpp
/usr/include/boost/mpi/graph_communicator.hpp
/usr/include/boost/mpi/group.hpp
/usr/include/boost/mpi/inplace.hpp
/usr/include/boost/mpi/intercommunicator.hpp
/usr/include/boost/mpi/nonblocking.hpp
/usr/include/boost/mpi/operations.hpp
/usr/include/boost/mpi/packed_iarchive.hpp
/usr/include/boost/mpi/packed_oarchive.hpp
/usr/include/boost/mpi/python/
/usr/include/boost/mpi/python.hpp
/usr/include/boost/mpi/python/config.hpp
/usr/include/boost/mpi/python/serialize.hpp
/usr/include/boost/mpi/python/skeleton_and_content.hpp
/usr/include/boost/mpi/request.hpp
/usr/include/boost/mpi/skeleton_and_content.hpp
/usr/include/boost/mpi/skeleton_and_content_fwd.hpp
/usr/include/boost/mpi/status.hpp
/usr/include/boost/mpi/timer.hpp