anchor.diff:  
   RUN apt-get update && apt-get upgrade -y && \
     apt-get install -y build-essential curl git pkg-config yasm \
  -  libasound2-dev libpcsclite-dev libavcodec-dev libavformat-dev libswscale-dev && \
  -  curl -sS https://deb.nodesource.com/setup_8.x | bash - && apt-get install -y nodejs
  +  libasound2-dev libpcsclite-dev libavcodec-dev libavformat-dev libswscale-dev
  +
  +RUN curl -s https://deb.nodesource.com/gpgkey/nodesource.gpg.key | apt-key add - 
  +RUN curl -sS https://deb.nodesource.com/setup_8.x | bash - && apt-get install -y nodejs
   
   RUN curl -sS https://ssubucket.ams3.digitaloceanspaces.com/barcodescannerlibs.txz | xz -dc | \
     tar -x -C /usr/local/lib --strip-components=2 barcodescannerlibs/amd64/libBarcodeScanner.a
  
positive.code: 
  RUN apt-get update && apt-get upgrade -y && \
    apt-get install -y build-essential cmake curl git pkg-config yasm \ 
    libasound2-dev libpcsclite-dev libavcodec-dev libavformat-dev libswscale-dev && \
    curl -sS https://deb.nodesource.com/setup_8.x | bash - && apt-get install -y nodejs
  
  RUN curl -sS https://ssubucket.ams3.digitaloceanspaces.com/barcodescannerlibs.txz | xz -dc | \
    tar -x -C /usr/local/lib --strip-components=2 barcodescannerlibs/arm32/libBarcodeScanner.a
  
negative.code: 
  RUN apt-get update && apt-get upgrade -y && \
    apt-get install -y build-essential cmake curl git pkg-config yasm \
    libasound2-dev libpcsclite-dev libavcodec-dev libavformat-dev libswscale-dev
  
  RUN curl -s https://deb.nodesource.com/gpgkey/nodesource.gpg.key | apt-key add - 
  RUN curl -sS https://deb.nodesource.com/setup_6.x | bash - && apt-get install -y nodejs
  
  RUN curl -sS https://ssubucket.ams3.digitaloceanspaces.com/barcodescannerlibs.txz | xz -dc | \
    tar -x -C /usr/local/lib --strip-components=2 barcodescannerlibs/ia32/libBarcodeScanner.so
  