anchor.diff:  # - Xvfb for Python modules requiring X11
   # - GhostScript & ImageMagick for image manipulation
   RUN rpm --rebuilddb && fsudo yum install -y \
  -  gcc python-devel \
  -  python-virtualenv \
  +  gcc python34-devel \
     blas-devel lapack-devel \
     libpng-devel freetype-devel \
     hdf5-devel \
  
positive.code:   ghostscript ImageMagick
  
  # Install system-indepedent python environment
  RUN virtualenv /opt/python && \
    mkdir -p /opt/ipython
  
  # Install from PIP
  
negative.code: COPY opt /opt
  COPY var /var
  
  # Because COPY doesn't respect USER...
  USER root
  RUN chown -R researcher:researcher /etc /opt /var
  USER researcher
  