title: Failed to install "Cairocffi"
body: <p>I'm working with python3, and i'm trying to install " <strong>cairocffi</strong>" on Ubuntu.
  To do this, i've successfully installed:</p>
  
  <ol>
  <li>python-dev</li>
  <li>libffi-dev</li>
  <li>cffi</li>
  </ol>
  
  <p>But when i've trying to install "cairocffi" with <code>pip install cairocffi</code>,I got:</p>
  
  <pre><code>      File "/usr/local/lib/python3.2/dist-packages/setuptools/dist.py", line 272
  , in __init__
          _Distribution.__init__(self,attrs)
        File "/usr/lib/python3.2/distutils/dist.py", line 261, in __init__
          self.finalize_options()
        File "/usr/local/lib/python3.2/dist-packages/setuptools/dist.py", line 327
  , in finalize_options
          ep.load()(self, ep.name, value)
        File "/usr/local/lib/python3.2/dist-packages/cffi/setuptools_ext.py", line
   161, in cffi_modules
          add_cffi_module(dist, cffi_module)
        File "/usr/local/lib/python3.2/dist-packages/cffi/setuptools_ext.py", line
   48, in add_cffi_module
          execfile(build_file_name, mod_vars)
        File "/usr/local/lib/python3.2/dist-packages/cffi/setuptools_ext.py", line
   24, in execfile
          exec(code, glob, glob)
        File "cairocffi/ffi_build.py", line 30, in &lt;module&gt;
          ffi.cdef(constants._CAIRO_HEADERS)
      AttributeError: 'module' object has no attribute '_CAIRO_HEADERS'
  
      ----------------------------------------
      Command "python setup.py egg_info" failed with error code 1 in /tmp/pip-build-y0b_ir/cairocffi
  </code></pre>