title: pandas ValueError: numpy.dtype has the wrong size, try recompiling
body: <p>I took a new clean install of OSX 10.9.3 and installed pip, and then did</p>
  
  <pre>
  pip install pandas
  pip install numpy
  </pre>
  
  <p>Both installs seemed to be perfectly happy, and ran without any errors (though there were a zillion warnings).  When I tried to run a python script with import pandas, I got the following error:</p>
  
  <pre>
  
      numpy.dtype has the wrong size, try recompiling Traceback (most recent call last): 
      File "./moen.py", line 7, in  import pandas File "/Library/Python/2.7/site-packages/pandas/__init__.py", line 6, in  from . import hashtable, tslib, lib 
      File "numpy.pxd", line 157, in init pandas.hashtable (pandas/hashtable.c:22331) 
      ValueError: numpy.dtype has the wrong size, try recompiling
  
  </pre>
  
  <p>How do I fix this error and get pandas to load properly?</p>