anchor.diff:  RUN apt-get update && \
       apt-cache policy esl-erlang && \
       apt-get install -y esl-erlang=1:$ERLANG_VERSION && \
  -    apt-get clean
  +    rm -rf /var/lib/apt/lists/*
   
   # Elixir
   
  
positive.code: ENV LC_ALL C.UTF-8
  ENV LANG C.UTF-8
  
  RUN apt-get update && apt-get install -y gpg curl wget unzip xz-utils git openssh-client bsdtar build-essential && apt-get clean -y
  
  ## Gradle
  
  RUN apt-get update && apt-get install -y --no-install-recommends openjdk-8-jdk gradle && apt-get clean -y
  
  ## Node.js
  
  
negative.code: 
  # Python
  
  RUN apt-get update && apt-get install -y python3.7-dev python3-distutils && \
      rm -rf /var/lib/apt/lists/*
  
  RUN rm -fr /usr/bin/python3 && ln /usr/bin/python3.7 /usr/bin/python3
  RUN rm -rf /usr/bin/python && ln /usr/bin/python3.7 /usr/bin/python
  