anchor.diff:  
   RUN apt-get update && \
       apt-get install -y --no-install-recommends \
  -        git=1:2.7.4-0ubuntu1.1 \
  -        curl=7.47.0-1ubuntu2.2 \
  -        wget=1.17.1-1ubuntu1.2 \
  -        unzip=6.0-20ubuntu1 \
  -        build-essential=12.1ubuntu2 \
  -        gcc-5=5.4.0-6ubuntu1~16.04.4 \
  -        g++-5=5.4.0-6ubuntu1~16.04.4 \
  -        cmake=3.5.1-1ubuntu3 \
  -        lcov=1.12-2 \
  -        software-properties-common=0.96.20.7 \
  -        pkg-config=0.29.1-0ubuntu1 && \
  +        git \
  +        curl \
  +        wget \
  +        unzip \
  +        build-essential \
  +        gcc-5 \
  +        g++-5 \
  +        cmake \
  +        lcov \
  +        software-properties-common \
  +        pkg-config && \
       apt-get clean && \
       rm -rf /var/lib/apt/lists/*
   
  
positive.code: 
  # install opencv 3.2
  WORKDIR /
  RUN wget https://github.com/Itseez/opencv/archive/3.2.0.zip \
      && unzip 3.2.0.zip \
      && mkdir /opencv-3.2.0/cmake_binary && cd /opencv-3.2.0/cmake_binary \
      && cmake -D CMAKE_BUILD_TYPE=RELEASE -D CMAKE_INSTALL_PREFIX=/usr/local .. \
      && make install \
      && rm /3.2.0.zip \
      && rm -r /opencv-3.2.0
  
negative.code: RUN add-apt-repository ppa:jonathonf/ffmpeg-3 -y && \
      apt-get update && \
      apt-get install -y --no-install-recommends \ 
          ffmpeg \
          libav-tools \
          x264 \
          x265 \
          libavcodec-dev \
          libavformat-dev \
          libavutil-dev \
          libswscale-dev \
          libavresample-dev && \
      apt-get clean && \
      rm -rf /var/lib/apt/lists/*
  
  