[firedrake] ubuntu 14.04 build problem

Hi, I just installed firedrake globally with --global --sudo options. I get this: Successfully installed firedrake Cleaning up... Creating firedrake-update script. Successfully installed Firedrake. To upgrade firedrake, run firedrake/bin/firedrake-update Now to test it: osman@osman-desktop:~/FIREDRAKE$ python helmholtz.py Traceback (most recent call last): File "helmholtz.py", line 47, in <module> from firedrake import * File "/usr/local/lib/python2.7/dist-packages/firedrake/__init__.py", line 3, in <module> from pyop2_utils import enable_mpi_prefork ImportError: cannot import name enable_mpi_prefork Have I missed anything? python is 2.7, cython0.23 Thanks in advance -osman