anchor.diff:  ### CPPCheck
   ENV CPPCHECK_VERSION 1.61-1
   
  -RUN apt-get update && apt-get install -y \
  +RUN apt-get update \
  + && apt-get install -y \
       cppcheck=$CPPCHECK_VERSION \
  -  && rm -rf /var/lib/apt/lists/*
  + && rm -rf /var/lib/apt/lists/*
   
   ### GoLint
   RUN go get github.com/golang/lint/golint
  
positive.code: ENV NPM_VERSION 2.1.16
  
  RUN curl -SLO "http://nodejs.org/dist/v$NODE_VERSION/node-v$NODE_VERSION-linux-x64.tar.gz" \
    && curl -SLO "http://nodejs.org/dist/v$NODE_VERSION/SHASUMS256.txt.asc" \
    && gpg --verify SHASUMS256.txt.asc \
    && grep " node-v$NODE_VERSION-linux-x64.tar.gz\$" SHASUMS256.txt.asc | sha256sum -c - \
    && tar -xzf "node-v$NODE_VERSION-linux-x64.tar.gz" -C /usr/local --strip-components=1 \
    && rm "node-v$NODE_VERSION-linux-x64.tar.gz" SHASUMS256.txt.asc \
    && npm install -g npm@"$NPM_VERSION" \
    && npm cache clear
  
  ### Ruby
  RUN apt-get update && apt-get install -y \
      curl \
      procps \
    && rm -rf /var/lib/apt/lists/*
  
  ENV RUBY_MAJOR 2.2
  ENV RUBY_VERSION 2.2.0
  
negative.code: RUN set -x \
   && mkdir -p /usr/src/python \
   && curl -SL "https://www.python.org/ftp/python/$PYTHON_VERSION/Python-$PYTHON_VERSION.tar.xz" \
    | tar -xJC /usr/src/python --strip-components=1 \
   && cd /usr/src/python \
   && ./configure --enable-shared \
   && make -j$(nproc) \
  