/usr/include/x86_64-linux-gnu/eckit/mpi/ is in libodb-api-dev 0.17.6-2build1.
This file is owned by root:root, with mode 0o755.
..
/usr/include/x86_64-linux-gnu/eckit/mpi/Buffer.h
/usr/include/x86_64-linux-gnu/eckit/mpi/Comm.h
/usr/include/x86_64-linux-gnu/eckit/mpi/DataType.h
/usr/include/x86_64-linux-gnu/eckit/mpi/Operation.h
/usr/include/x86_64-linux-gnu/eckit/mpi/Parallel.h
/usr/include/x86_64-linux-gnu/eckit/mpi/ParallelRequest.h
/usr/include/x86_64-linux-gnu/eckit/mpi/ParallelStatus.h
/usr/include/x86_64-linux-gnu/eckit/mpi/Request.h
/usr/include/x86_64-linux-gnu/eckit/mpi/Serial.h
/usr/include/x86_64-linux-gnu/eckit/mpi/SerialData.h
/usr/include/x86_64-linux-gnu/eckit/mpi/SerialRequest.h
/usr/include/x86_64-linux-gnu/eckit/mpi/SerialStatus.h
/usr/include/x86_64-linux-gnu/eckit/mpi/Status.h