title: ImportError: No module named _backend_gdk
body: <p>I am starting to get some insight into interactive plotting with python and matplotlib using pyGTK+. Therefore I took a look at the <a href="http://matplotlib.org/examples/user_interfaces/gtk_spreadsheet.html" rel="nofollow noreferrer">example given at the matplotlib website</a>.</p>
  
  <p>This is a short exerpt of the Code:</p>
  
  <pre><code>#!/usr/bin/env python
  """
  Example of embedding matplotlib in an application and interacting with
  a treeview to store data.  Double click on an entry to update plot
  data
  
  """
  import pygtk
  pygtk.require('2.0')
  import gtk
  from gtk import gdk
  
  import matplotlib
  matplotlib.use('GTKAgg')  # or 'GTK'
  from matplotlib.backends.backend_gtk import FigureCanvasGTK as FigureCanvas
  
  from numpy.random import random
  from matplotlib.figure import Figure
  </code></pre>
  
  <p>Ones I try to run this Script in the Terminal I get the following error:</p>
  
  <pre><code>Traceback (most recent call last):
    File "gtk_spreadsheet.py", line 15, in &lt;module&gt;
      from matplotlib.backends.backend_gtk import FigureCanvasGTK as FigureCanvas
    File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/matplotlib/backends/backend_gtk.py", line 33, in &lt;module&gt;
      from matplotlib.backends.backend_gdk import RendererGDK, FigureCanvasGDK
    File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/matplotlib/backends/backend_gdk.py", line 29, in &lt;module&gt;
      from matplotlib.backends._backend_gdk import pixbuf_get_pixels_array
  ImportError: No module named _backend_gdk
  </code></pre>
  
  <p>I have python 2.7 and pygtk 2.24 installed.</p>
  
  <p>Can anyone figure out where the error is located? I think it might be connected to some linking issues?</p>