anchor.diff:  
   # Build OpenCV 3.x
   # =================================
  -RUN apt-get update -qq && apt-get install -y --force-yes libopencv-dev
  +#RUN apt-get update -qq && apt-get install -y --force-yes libopencv-dev
   WORKDIR /usr/local/src
   RUN mkdir -p opencv/release
   WORKDIR /usr/local/src/opencv/release
  
positive.code:     autoconf \
      automake \
      mercurial \
      libopencv-dev \
      build-essential \
      checkinstall \
      cmake \
  
negative.code:             --enable-libvorbis \
              --enable-libvpx \
              --enable-libx264 \
              --enable-nonfree
  RUN make -j ${NUM_CORES}
  RUN make install
  