Matplotlib import error

[C Smith]

I had python 2.7.6 installed on OS X yosemite, which has always worked
fine, until I tried to install matplotlib with pip. I got the same
error below and upgraded to 2.7.9, used pip to upgrade all the
packages, but still get the same error.

>>> import matplotlib
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/Library/Python/2.7/site-packages/matplotlib/__init__.py",
line 180, in <module>
    from matplotlib.cbook import is_string_like
  File "/Library/Python/2.7/site-packages/matplotlib/cbook.py", line
33, in <module>
    import numpy as np
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/numpy/__init__.py",
line 170, in <module>
    from . import add_newdocs
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/numpy/add_newdocs.py",
line 13, in <module>
    from numpy.lib import add_newdoc
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/numpy/lib/__init__.py",
line 18, in <module>
    from .polynomial import *
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/numpy/lib/polynomial.py",
line 19, in <module>
    from numpy.linalg import eigvals, lstsq, inv
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/numpy/linalg/__init__.py",
line 51, in <module>
    from .linalg import *
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/numpy/linalg/linalg.py",
line 29, in <module>
    from numpy.linalg import lapack_lite, _umath_linalg
ImportError: dlopen(/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/numpy/linalg/lapack_lite.so,
2): Symbol not found: __gfortran_compare_string
  Referenced from:
/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/numpy/linalg/lapack_lite.so
  Expected in: flat namespace
 in /Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/numpy/linalg/lapack_lite.so