anchor.diff:  ENV HOME /home/jovyan
   ENV SHELL /bin/bash
   ENV USER jovyan
  -ENV PATH $CONDA_DIR/bin:$PATH
  +ENV PATH $CONDA_DIR/bin:$CONDA_DIR/envs/python2/bin:$PATH
   WORKDIR $HOME
   
   USER jovyan
  
positive.code: # Julia dependencies
  RUN apt-get install -y julia libnettle4 && apt-get clean
  
  # R dependencies that conda can't provide (X, fonts)
  RUN apt-get install -y libxrender1 fonts-dejavu && apt-get clean
  
  # The Glorious Glasgow Haskell Compiler
  RUN apt-get install -y --no-install-recommends software-properties-common && apt-get clean
  
negative.code: RUN julia -e 'Pkg.add("Gadfly")' && julia -e 'Pkg.add("RDatasets")'
  
  # IHaskell
  RUN cabal update && \
      cabal install cpphs && \
      cabal install gtk2hs-buildtools && \
  