title: how get the right numpy
body: <p>I am trying to install bcolz package for python 2.7 on Mac OS X 10.8.
  If I use</p>
  
  <pre><code>python setup.py install
  </code></pre>
  
  <p>The result is:</p>
  
  <pre><code>* Found Cython 0.20.2 package installed.
  * Found numpy 1.8.1 package installed.
  * Found numexpr 2.4 package installed.
  running install
  running build
  running build_py
  ....
  error: could not create '/Library/Python/2.7/site-packages/bcolz': Permission denied
  </code></pre>
  
  <p>So I tried:</p>
  
  <pre><code>sudo python setup.py install
  </code></pre>
  
  <p>But now it seemed to look for old numpy</p>
  
  <pre><code>* Found Cython 0.20.2 package installed.
  .. ERROR:: You need numpy 1.7 or greater to run bcolz!
  </code></pre>
  
  <p>Could someone help me to explain this and show me away to get around? Thank you.</p>