anchor.diff:  
   # PHP Composer
   
  -RUN apt-get update && apt-get install -y php-cli php-mbstring && apt-get clean
  +RUN apt-get update && apt-get install -y php-cli php-mbstring && \
  +    rm -rf /var/lib/apt/lists/*
   
   ENV COMPOSER_VERSION=1.8.6
   
  
positive.code: 
  # Python
  
  RUN apt-get update && apt-get install -y python3.7-dev python3-distutils && apt-get clean
  
  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
  
negative.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 && \
      rm -rf /var/lib/apt/lists/*
  
  ## Gradle
  
  RUN apt-get update && apt-get install -y --no-install-recommends openjdk-8-jdk gradle && \
      rm -rf /var/lib/apt/lists/*
  
  ## Node.js
  
  