anchor.diff:  
       # install gopherlab
       ( \
  -        echo 'export GOPATH="/opt/go"' \
  -        echo 'export PATH="$PATH:/usr/local/go/bin:$GOPATH/bin"' \
  +        echo 'export GOPATH="/opt/go"'; \
  +        echo 'export PATH="$PATH:/usr/local/go/bin:$GOPATH/bin"'; \
       ) >>/etc/profile.d/golang.sh && \
       . /etc/profile.d/golang.sh && \
       ln -s /usr/local/go/bin/go /bin/ && \
  
positive.code:     # install pandoc, asciidoc, xvfb and wkhtmltopdf
      conda install -y pandoc && \
      apt-get install -y asciidoc asciidoctor xvfb wkhtmltopdf && \
  
      # install ijavascript and itypescript
      apt-get install -y nodejs-legacy npm && \
  
negative.code:     apt-get update -y && \
      apt-get upgrade -y && \
      ( \
          echo 'export JAVA_HOME="/usr/lib/jvm/java-8-openjdk-amd64"'; \
          echo 'export PATH="$PATH:$JAVA_HOME/bin"'; \
      ) >>/etc/profile.d/openjdk.sh && \
      . /etc/profile.d/openjdk.sh && \
      apt-get install -y -t jessie-backports openjdk-8-jdk && \
  