--- setup.py.orig	2011-04-07 15:26:45.000000000 +0400
+++ setup.py	2011-04-07 15:27:57.000000000 +0400
@@ -6,12 +6,16 @@
 #  * faster adding of contours from NumPy arrays
 #  * data style STYLE_NUMPY to get contours and TriStrips
 #    as NumPy arrays
-withNumPy=False
+withNumPy=True
 
 # if withNumPy is True, set the include path for numpy/arrayobject.h
 # the example is for python on Windows:
 # numPyIncludePath='C:\\Python26\\Lib\\site-packages\\numpy\\core\\include'
-numPyIncludePath=''
+try:
+    import numpy
+except ImportError:
+    raise Exception("PYTHON interface requires numpy")
+numPyIncludePath = numpy.get_include()
 
 # defaultStyle may be used to set the default style to one of:
 #  * STYLE_TUPLE to get tuples of points