anchor.diff:  # Install packer to /usr/local/bin
   RUN mkdir -p /tmp/packer \
     && cd /tmp/packer \
  -  && wget https://releases.hashicorp.com/packer/0.8.6/packer_0.8.6_linux_amd64.zip \
  +  && wget --no-verbose https://releases.hashicorp.com/packer/0.8.6/packer_0.8.6_linux_amd64.zip \
     && unzip packer_0.8.6_linux_amd64.zip \
     && mv packer /usr/local/bin \
     && mv packer-* /usr/local/bin \
  
positive.code: RUN curl https://storage.googleapis.com/golang/go1.5.3.linux-amd64.tar.gz | tar -C /usr/local -zx
  
  # Install nodejs
  RUN wget -O /tmp/nodejs.sh https://deb.nodesource.com/setup_5.x \
    && /bin/bash /tmp/nodejs.sh \
    && apt-get install -y nodejs \
    && apt-get clean autoclean \
  
negative.code: # Install Maven
  RUN mkdir -p /tmp/maven \
    && cd /tmp/maven \
    && wget --no-verbose http://apache.mirror.rafal.ca/maven/maven-3/3.3.3/binaries/apache-maven-3.3.3-bin.tar.gz \
    && tar xzf apache-maven-3.3.3-bin.tar.gz \
    && mv apache-maven-3.3.3 /usr/share/maven3 \
    && update-alternatives --install /usr/bin/mvn mvn /usr/share/maven3/bin/mvn 1 \
  