anchor.diff:  RUN mv microsoft.gpg /etc/apt/trusted.gpg.d/microsoft.gpg
   RUN sh -c 'echo "deb [arch=amd64] https://packages.microsoft.com/repos/microsoft-ubuntu-xenial-prod xenial main" > /etc/apt/sources.list.d/dotnetdev.list'
   
  -RUN apt-get update
  -RUN apt-get install nodejs maven default-jdk clang binutils golang-go --assume-yes
  -RUN apt-get install dotnet-sdk-2.0.0 --assume-yes
  +RUN apt-get -y update
  +RUN apt-get -y install nodejs maven default-jdk clang binutils golang-go --assume-yes
  +RUN apt-get -y install dotnet-sdk-2.0.0 --assume-yes
   
   # Install Boost for C++
  -RUN apt-get install libboost-all-dev --assume-yes
  -RUN apt-get update && apt-get install software-properties-common python-software-properties --assume-yes
  +RUN apt-get -y install libboost-all-dev --assume-yes
  +RUN apt-get -y update && apt-get -y install software-properties-common python-software-properties --assume-yes
   RUN add-apt-repository ppa:jonathonf/gcc-7.1
  -RUN apt-get update
  -RUN apt-get install g++-7 --assume-yes
  +RUN apt-get -y update
  +RUN apt-get -y install g++-7 --assume-yes
   RUN update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-7 60 --slave /usr/bin/g++ g++ /usr/bin/g++-7
   RUN update-alternatives --config gcc
   
  
positive.code: RUN mkdir ${workdir}
  WORKDIR ${workdir}
  
  RUN apt-get update --fix-missing
  RUN apt-get install curl git apt-transport-https --assume-yes
  
  # Install Swift
  RUN curl -o swift.tar.gz https://swift.org/builds/swift-4.1.3-release/ubuntu1604/swift-4.1.3-RELEASE/swift-4.1.3-RELEASE-ubuntu16.04.tar.gz
  
negative.code: 
  # Python
  RUN add-apt-repository ppa:jonathonf/python-3.6
  RUN apt-get -y update
  RUN apt-get -y install python3.6 --assume-yes
  RUN curl https://bootstrap.pypa.io/get-pip.py | python3.6
  RUN pip3.6 install mypy python-dateutil
  
  # Dart
  RUN apt-get -y install apt-transport-https
  RUN sh -c 'curl https://dl-ssl.google.com/linux/linux_signing_key.pub | apt-key add -'
  RUN sh -c 'curl https://storage.googleapis.com/download.dartlang.org/linux/debian/dart_stable.list > /etc/apt/sources.list.d/dart_stable.list'
  RUN apt-get -y update
  RUN apt-get -y install dart
  
  # Crystal
  RUN curl -sL "https://keybase.io/crystal/pgp_keys.asc" | apt-key add -
  RUN echo "deb https://dist.crystal-lang.org/apt crystal main" | tee /etc/apt/sources.list.d/crystal.list
  RUN apt-get -y update
  RUN apt-get -y install crystal --assume-yes
  
  ENV PATH="${workdir}/node_modules/.bin:${PATH}"
  
  