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The Python 2 interpreter provided by Mac OS X fails when installing dependencies into the virtualenv.

Error log by CMake:

-- Installing python package dorie.utilities
CMake Error at /Users/lriedel/dune/dune-python/cmake/modules/DuneExecuteProcess.cmake:26 (message):
  Fatal error when installing the package at utilities into the env.

  Run
  command:/Users/lriedel/dune/dune-python/build-cmake/python-env/bin/python;-m;pip;install;-r;/Users/lriedel/dune/dorie/python/utilities/requirements.txt;-q;-e;.;WORKING_DIRECTORY;/Users/lriedel/dune/dorie/python/utilities


  Return code: 1

  Detailed log:

  Command "/Users/lriedel/dune/dune-python/build-cmake/python-env/bin/python
  -u -c "import setuptools,
  tokenize;__file__='/private/var/folders/l8/8k0kkwt53kx94yxn2jnpm4s40000gn/T/pip-build-mrRx6N/subprocess32/setup.py';f=getattr(tokenize,
  'open', open)(__file__);code=f.read().replace('\r\n',
  '\n');f.close();exec(compile(code, __file__, 'exec'))" install --record
  /var/folders/l8/8k0kkwt53kx94yxn2jnpm4s40000gn/T/pip-_osbiK-record/install-record.txt
  --single-version-externally-managed --compile --install-headers
  /Users/lriedel/dune/dune-python/build-cmake/python-env/include/site/python2.7/subprocess32"
  failed with error code 1 in
  /private/var/folders/l8/8k0kkwt53kx94yxn2jnpm4s40000gn/T/pip-build-mrRx6N/subprocess32/


Call Stack (most recent call first):
  /Users/lriedel/dune/dune-python/cmake/modules/InstallPythonPackage.cmake:92 (dune_execute_process)
  python/CMakeLists.txt:3 (dune_install_python_package)
  python/CMakeLists.txt:9 (install_python_package)


-- Configuring incomplete, errors occurred!