failed to build version 0.12

[Jean-Patrick Pommier]

Hello,

Thank you for this new version of scikit-image.

I met the following message when i try to upgrade scikit-image (linux):

$ pip install --upgrade scikit-image
Collecting scikit-image
  Using cached scikit-image-0.12.0.tar.gz
    Complete output from command python setup.py egg_info:
    Partial import of skimage during the build process.
    Traceback (most recent call last):
      File "<string>", line 1, in <module>
      File "/tmp/pip-build-rR00uc/scikit-image/setup.py", line 146, in 
<module>
        **extra
      File "/usr/lib/python2.7/site-packages/numpy/distutils/core.py", line 
135, in setup
        config = configuration()
      File "/tmp/pip-build-rR00uc/scikit-image/setup.py", line 69, in 
configuration
        config.add_subpackage('skimage')
      File "/usr/lib/python2.7/site-packages/numpy/distutils/misc_util.py", 
line 1002, in add_subpackage
        caller_level = 2)
      File "/usr/lib/python2.7/site-packages/numpy/distutils/misc_util.py", 
line 971, in get_subpackage
        caller_level = caller_level + 1)
      File "/usr/lib/python2.7/site-packages/numpy/distutils/misc_util.py", 
line 908, in _get_configuration_from_setup_py
        config = setup_module.configuration(*args)
      File "skimage/setup.py", line 21, in configuration
        config.add_subpackage('morphology')
      File "/usr/lib/python2.7/site-packages/numpy/distutils/misc_util.py", 
line 1002, in add_subpackage
        caller_level = 2)
      File "/usr/lib/python2.7/site-packages/numpy/distutils/misc_util.py", 
line 971, in get_subpackage
        caller_level = caller_level + 1)
      File "/usr/lib/python2.7/site-packages/numpy/distutils/misc_util.py", 
line 908, in _get_configuration_from_setup_py
        config = setup_module.configuration(*args)
      File "skimage/morphology/setup.py", line 19, in configuration
        cython(['_skeletonize_3d_cy.pyx.in'], working_path=base_path)
      File "skimage/_build.py", line 39, in cython
        if not _changed(pyxfile):
      File "skimage/_build.py", line 70, in _changed
        with open(filename, 'rb') as f:
    IOError: [Errno 2] No such file or directory: 
'/tmp/pip-build-rR00uc/scikit-image/skimage/morphology/_skeletonize_3d_cy.pyx.in'

I got the same message working with sudo or from a virtual env.

Best regards
jean-patrick
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