anchor.diff:      autoconf \
       automake \
       mercurial \
  -    libopencv-dev \
       build-essential \
       checkinstall \
       cmake \
  
positive.code: 
  # Build OpenCV 3.x
  # =================================
  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
  
negative.code:             --enable-libvorbis \
              --enable-libvpx \
              --enable-libx264 \
              --enable-nonfree
  RUN make -j ${NUM_CORES}
  RUN make install
  