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POCython: Symbol not found: _PyCFunction_Check
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copied!<p>I am trying to get the <a href="http://docs.cython.org/src/userguide/tutorial.html" rel="nofollow">basic Cython tutorial</a> to work. So I have</p> <p><code>hello.pyx</code>:</p> <pre><code>def say_hello_to(name): print("Hello %s!" % name) </code></pre> <p>And <code>setup.py</code>:</p> <pre><code>from distutils.core import setup from distutils.extension import Extension from Cython.Distutils import build_ext ext_modules = [Extension("hello", ["hello.pyx"])] setup( name = 'Hello world app', cmdclass = {'build_ext': build_ext}, ext_modules = ext_modules ) </code></pre> <p>However, trying to compile I get this error:</p> <pre><code>$ python setup.py build_ext --inplace running build_ext failed to import Cython: dlopen(/usr/local/lib/python2.7/site-packages/Cython/Compiler/Scanning.so, 2): Symbol not found: _PyCFunction_Check Referenced from: /usr/local/lib/python2.7/site-packages/Cython/Compiler/Scanning.so Expected in: flat namespace in /usr/local/lib/python2.7/site-packages/Cython/Compiler/Scanning.so error: Cython does not appear to be installed </code></pre> <p>Cython <em>is</em> installed and <code>scanning.so</code> does appear to contain the symbol in question:</p> <pre><code>$ nm -gl /usr/local/lib/python2.7/site-packages/Cython/Compiler/Scanning.so | grep _PyCFunction_Check U _PyCFunction_Check </code></pre> <p>Any ideas? I'm on OS X 10.7.5 using homebrew python 2.7.3.</p> <p><strong>Edit:</strong> As pointed out by @bdash' comment below, <code>U _PyCFunction_Check</code> actually means that <code>_PyCFunction_Check</code> is undefined.</p>

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