[scikit-image] Installing from pypi tarball without cython

[Stuart Mumford]

Hello,

I have just run into an error while trying to install scikit-image from the pip tarball on linux (as part of the SunPy test infrastructure). It seems that the PyPI tarball needs Cython to be installed:

 pip install --no-binary=:all: --no-cache-dir scikit-image Collecting scikit-image  Downloading https://files.pythonhosted.org/packages/fc/20/d3e736493b16e9455ce8579722d644b313814c599d5824d34e448845f746/scikit-image-0.14.0.tar.gz (27.0MB)    100% |████████████████████████████████| 27.0MB 5.9MB/s     Complete output from command python setup.py egg_info:    Partial import of skimage during the build process.    Traceback (most recent call last):      File "/tmp/pip-install-ypyllick/scikit-image/skimage/_build.py", line 30, in cython        from Cython import __version__    ModuleNotFoundError: No module named 'Cython'        During handling of the above exception, another exception occurred:        Traceback (most recent call last):      File "<string>", line 1, in <module>      File "/tmp/pip-install-ypyllick/scikit-image/setup.py", line 149, in <module>        **extra      File "/opt/miniconda/envs/clean/lib/python3.7/site-packages/numpy/distutils/core.py", line 135, in setup        config = configuration()      File "/tmp/pip-install-ypyllick/scikit-image/setup.py", line 70, in configuration        config.add_subpackage('skimage')      File "/opt/miniconda/envs/clean/lib/python3.7/site-packages/numpy/distutils/misc_util.py", line 1034, in add_subpackage        caller_level = 2)      File "/opt/miniconda/envs/clean/lib/python3.7/site-packages/numpy/distutils/misc_util.py", line 1003, in get_subpackage        caller_level = caller_level + 1)      File "/opt/miniconda/envs/clean/lib/python3.7/site-packages/numpy/distutils/misc_util.py", line 940, in _get_configuration_from_setup_py        config = setup_module.configuration(*args)      File "skimage/setup.py", line 14, in configuration        config.add_subpackage('feature')      File "/opt/miniconda/envs/clean/lib/python3.7/site-packages/numpy/distutils/misc_util.py", line 1034, in add_subpackage        caller_level = 2)      File "/opt/miniconda/envs/clean/lib/python3.7/site-packages/numpy/distutils/misc_util.py", line 1003, in get_subpackage        caller_level = caller_level + 1)      File "/opt/miniconda/envs/clean/lib/python3.7/site-packages/numpy/distutils/misc_util.py", line 940, in _get_configuration_from_setup_py        config = setup_module.configuration(*args)      File "skimage/feature/setup.py", line 22, in configuration        cython(['_haar.pyx'], working_path=base_path)      File "/tmp/pip-install-ypyllick/scikit-image/skimage/_build.py", line 42, in cython        % CYTHON_VERSION)    RuntimeError: Cython >= 0.23 is required to build scikit-image from git checkout    Cython >= 0.23 not found; falling back to pre-built geometry.c    Cython >= 0.23 not found; falling back to pre-built transform.c    Cython >= 0.23 not found; falling back to pre-built interpolation.c    Cython >= 0.23 not found; falling back to pre-built _draw.c    Cython >= 0.23 not found; falling back to pre-built corner_cy.c    Cython >= 0.23 not found; falling back to pre-built censure_cy.c    Cython >= 0.23 not found; falling back to pre-built orb_cy.c    Cython >= 0.23 not found; falling back to pre-built brief_cy.c    Cython >= 0.23 not found; falling back to pre-built _texture.c    Cython >= 0.23 not found; falling back to pre-built _hessian_det_appx.c    Cython >= 0.23 not found; falling back to pre-built _hoghistogram.c        ---------------------------------------- 

Command "python setup.py egg_info" failed with error code 1 in /tmp/pip-install-ypyllick/scikit-image/

I don't know if this is a bug in the tarball / setup machinery or if it's some silly mistake I am making.

Thanks for any help,
Stuart
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