anchor.diff:  
   # Add Julia kernel
   # https://github.com/JuliaLang/IJulia.jl
  -RUN julia -e 'Pkg.add("IJulia")'
   # https://github.com/JuliaLang/IJulia.jl/issues/341
  -
  -# precompilation
  -RUN julia -e 'using IJulia'
  +RUN julia -e 'Pkg.add("IJulia")' \
  +	&& RUN julia -e 'using IJulia'
   
   # registers global kernel
   RUN cp -r ~/.local/share/jupyter/kernels/julia-0.4 /usr/local/share/jupyter/kernels 
  
positive.code: 
  # Jupyter
  # Add python2.7 kernel: https://github.com/jupyter/jupyter/issues/71
  RUN pip3 install IPython jupyterhub notebook ipykernel
  RUN python3 -m ipykernel install
  RUN pip2 install IPython notebook ipykernel
  RUN /usr/local/python2.7/bin/python2.7 -m ipykernel install
  RUN npm install -g configurable-http-proxy
  
  # Support for other languages
  
negative.code: # Upgrade pip
  # https://pip.pypa.io/en/stable/installing/#upgrading-pip
  RUN pip2 install -U pip
  
  RUN pip3 install -U pip
  
  # LLVM deps
  