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: # R
  # http://irkernel.github.io/installation/
  RUN yum -y install czmq-devel
  RUN R -e 'install.packages(c("rzmq","repr","IRkernel","IRdisplay"), repos = c("http://irkernel.github.io/", getOption("repos")),type = "source")'
  # makes R kernel available for jupyter
  RUN R -e 'IRkernel::installspec(user = FALSE)'
  
  #################
  ## LIBS
  #################
  
  RUN pip2 install numpy pandas
  RUN pip3 install numpy pandas
  
  ####################
  ## Services
  
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
  