/usr/include/lam/mpi2cxx/ is in lam4-dev 7.1.2-2build1.
This file is owned by root:root, with mode 0o755.
..
/usr/include/lam/mpi2cxx/comm.h
/usr/include/lam/mpi2cxx/comm_inln.h
/usr/include/lam/mpi2cxx/constants.h
/usr/include/lam/mpi2cxx/datatype.h
/usr/include/lam/mpi2cxx/datatype_inln.h
/usr/include/lam/mpi2cxx/errhandler.h
/usr/include/lam/mpi2cxx/errhandler_inln.h
/usr/include/lam/mpi2cxx/exception.h
/usr/include/lam/mpi2cxx/functions.h
/usr/include/lam/mpi2cxx/functions_inln.h
/usr/include/lam/mpi2cxx/group.h
/usr/include/lam/mpi2cxx/group_inln.h
/usr/include/lam/mpi2cxx/info.h
/usr/include/lam/mpi2cxx/info_inln.h
/usr/include/lam/mpi2cxx/intercomm.h
/usr/include/lam/mpi2cxx/intercomm_inln.h
/usr/include/lam/mpi2cxx/intracomm.h
/usr/include/lam/mpi2cxx/intracomm_inln.h
/usr/include/lam/mpi2cxx/mpi2cxx_list.h
/usr/include/lam/mpi2cxx/mpi2cxx_map.h
/usr/include/lam/mpi2cxx/op.h
/usr/include/lam/mpi2cxx/op_inln.h
/usr/include/lam/mpi2cxx/pcomm.h
/usr/include/lam/mpi2cxx/pdatatype.h
/usr/include/lam/mpi2cxx/perrhandler.h
/usr/include/lam/mpi2cxx/pexception.h
/usr/include/lam/mpi2cxx/pgroup.h
/usr/include/lam/mpi2cxx/pgroup_inln.h
/usr/include/lam/mpi2cxx/pinfo.h
/usr/include/lam/mpi2cxx/pintercomm.h
/usr/include/lam/mpi2cxx/pintracomm.h
/usr/include/lam/mpi2cxx/pmpicxx.h
/usr/include/lam/mpi2cxx/pop.h
/usr/include/lam/mpi2cxx/pop_inln.h
/usr/include/lam/mpi2cxx/prequest.h
/usr/include/lam/mpi2cxx/prequest_inln.h
/usr/include/lam/mpi2cxx/pstatus.h
/usr/include/lam/mpi2cxx/pstatus_inln.h
/usr/include/lam/mpi2cxx/ptopology.h
/usr/include/lam/mpi2cxx/pwin.h
/usr/include/lam/mpi2cxx/request.h
/usr/include/lam/mpi2cxx/request_inln.h
/usr/include/lam/mpi2cxx/status.h
/usr/include/lam/mpi2cxx/status_inln.h
/usr/include/lam/mpi2cxx/topology.h
/usr/include/lam/mpi2cxx/topology_inln.h
/usr/include/lam/mpi2cxx/win.h
/usr/include/lam/mpi2cxx/win_inln.h