anchor.diff:  # - Useful IPython libraries
   # - SciPy & netCDF4 (which expect numpy to be installed first)
   RUN source /opt/python/bin/activate && \
  -  pip install --upgrade setuptools pip wheel && \
  +  pip install --upgrade pip wheel && \
     pip install \
       tornado pyzmq jinja2 \
       ipython \
  -    pyreadline \
  -    jsonschema functools32 \
  +    jsonschema \
       ipythonblocks numpy pandas matplotlib gitpython && \
     pip install scipy netCDF4 && \
     rm -rf /home/researcher/.cache
  
positive.code:   ghostscript ImageMagick
  
  # Install system-indepedent python environment
  RUN virtualenv /opt/python && \
    mkdir -p /opt/ipython
  
  # Install from PIP
  
negative.code: # - Xvfb for Python modules requiring X11
  # - GhostScript & ImageMagick for image manipulation
  RUN rpm --rebuilddb && fsudo yum install -y \
    gcc python34-devel \
    blas-devel lapack-devel \
    libpng-devel freetype-devel \
    hdf5-devel \
  