/usr/include/python3.4m/mpi4py is in python3-mpi4py 1.3.1+hg20131106-2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/include/python3.4m/../../lib/python3/dist-packages/mpi4py/include/mpi4py
/usr/include/python3.4m/../../lib/python3/dist-packages/mpi4py/include/mpi4py