Error when installing scikit-image via Python Interactor

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When there are issues using Slicer application as the python interpreter, I suggest to fallback to using a the plain python interpreter also bundled in the Slicer package.

The following could be done:

Step 1

Open a terminal

Step 2

Source the Slicer environment

$ eval $(./Slicer  --launcher-show-set-environment-commands)

Step 3

Install the package

Note that the name of the interpreter bundled with Slicer is python-real and not python

$ python-real -m "pip" install scikit-image
Collecting scikit-image
  Downloading scikit_image-0.13.1-cp27-cp27m-manylinux1_x86_64.whl (35.2MB)
  ...
Collecting matplotlib>=1.3.1 (from scikit-image)
  Downloading matplotlib-2.2.0-cp27-cp27m-manylinux1_x86_64.whl (12.5MB)
  ....
Collecting networkx>=1.8 (from scikit-image)
  Downloading networkx-2.1.zip (1.6MB)

[...]

Building wheels for collected packages: networkx, subprocess32

[...]
Running setup.py bdist_wheel for subprocess32 ... error
  Complete output from command /home/jcfr/Downloads/Slicer-4.8.1-linux-amd64/bin/python-real -u -c "import setuptools, tokenize;__file__='/tmp/pip-build-vTIc2o/subprocess32/setup.py';f=getattr(tokenize, 'open', open)(__file__);code=f.read().replace('\r\n', '\n');f.close();exec(compile(code, __file__, 'exec'))" bdist_wheel -d /tmp/tmpKY4kdZpip-wheel- --python-tag cp27:
  running bdist_wheel
  running build
  running build_py
  creating build
  creating build/lib.linux-x86_64-2.7
  copying subprocess32.py -> build/lib.linux-x86_64-2.7
  running build_ext
  building '_posixsubprocess' extension
  creating build/temp.linux-x86_64-2.7
  /usr/bin/gcc-4.6 -pthread -Wall -Wstrict-prototypes -fno-strict-aliasing -fwrapv -g -fPIC -I/home/jcfr/Downloads/Slicer-4.8.1-linux-amd64/lib/Python/include/python2.7 -c _posixsubprocess.c -o build/temp.linux-x86_64-2.7/_posixsubprocess.o
  unable to execute '/usr/bin/gcc-4.6': No such file or directory
  error: command '/usr/bin/gcc-4.6' failed with exit status 1
  
  ----------------------------------------
  Failed building wheel for subprocess32
  Running setup.py clean for subprocess32

[...]

issue

While there are python 2.7 wheels for most of the dependencies (scikit_image itself, matplotlib, etc …), there are no per-built binaries for subprocess32 for linux for python 2.7. See https://pypi.python.org/pypi/subprocess32/3.5.0rc1 and https://pypi.python.org/pypi/subprocess32/3.2.7

On linux, the expectation is that user of the package is expected to build from source.

Few approaches:

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