Traceback (most recent call last):
  File "/Users/aleserjavec/devel/orange/Orange/testing/regression/xtest_one.py", line 115, in <module>
    execfile(t__name)
  File "modules_hclust-test1.py", line 5, in <module>
    d = orngClustering.DendrogramPlotPylab(root, data=data, labels=[str(ex.getclass()) for ex in data])
  File "/Users/aleserjavec/devel/orange/Orange/clustering/hierarchical.py", line 845, in __init__
    raise ImportError("Could not import matplotlib module. Please make sure matplotlib is installed on your system.")
ImportError: Could not import matplotlib module. Please make sure matplotlib is installed on your system.
