anchor.diff: -FROM ubuntu:trusty
  -RUN apt-get update && apt-get install -y curl git-core build-essential wget unzip
  +FROM ubuntu:xenial
   
   # Versioning
   ENV PIP_INSTALL_VERSION 10.0.1
  
positive.code: ENV RUBY_VERSION 2.5.1
  ENV MIX_VERSION 1.0
  
  # nodejs seems to be required for the one of the gems
  RUN curl -sL https://deb.nodesource.com/setup_8.x | bash - && \
      apt-get -y install nodejs
  
  # install yarn
  RUN curl -sS https://dl.yarnpkg.com/debian/pubkey.gpg | sudo apt-key add - && \
    echo "deb https://dl.yarnpkg.com/debian/ stable main" | sudo tee /etc/apt/sources.list.d/yarn.list && \
    apt-get update && \
    apt-get install yarn
  
  
negative.code: 
  #install rvm
  RUN curl -sSL https://rvm.io/mpapis.asc | gpg --import && \
      curl -sSL https://get.rvm.io | bash -s stable --ruby=$RUBY_VERSION
  ENV PATH=/usr/local/rvm/bin:$PATH
  
  #install mix
  RUN wget https://packages.erlang-solutions.com/erlang-solutions_${MIX_VERSION}_all.deb && \
      dpkg -i erlang-solutions_${MIX_VERSION}_all.deb && \
      apt-get update && \
      apt-get install -y esl-erlang && \
      apt-get install -y elixir
  
  # install bundler
  RUN bash -lc "gem update --system && gem install bundler"
  