anchor.diff:      && hg clone https://bitbucket.org/multicoreware/x265 \
       && git clone --depth 1 git://source.ffmpeg.org/ffmpeg \
       && git clone https://github.com/Itseez/opencv.git \
  +    && git clone https://github.com/Itseez/opencv_contrib.git \
       && git clone --depth 1 git://github.com/mstorsjo/fdk-aac.git \
       && git clone --depth 1 https://chromium.googlesource.com/webm/libvpx \
       && git clone --depth 1 git://git.opus-codec.org/opus.git \
  
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:           -D WITH_TBB=ON \
            -D BUILD_PYTHON_SUPPORT=ON \
            -D WITH_V4L=ON \
            -D OPENCV_EXTRA_MODULES_PATH=../../opencv_contrib/modules \
            ..
  
  RUN make -j ${NUM_CORES} \
  