anchor.diff:          make install && \
           make distclean && \
           rm -rf ${DIR} && \
  -        DIR=$(mktemp -d) && cd ${DIR} && \
   # libvpx
  +        DIR=$(mktemp -d) && cd ${DIR} && \
           curl -s https://codeload.github.com/webmproject/libvpx/tar.gz/v${VPX_VERSION} | \
           tar zxf - -C . && \
           cd libvpx-${VPX_VERSION} && \
  
positive.code:         make && \
          make install && \
          make distclean && \
          rm -rf ${DIR}&& \
          DIR=$(mktemp -d) && cd ${DIR} && \
  # x264  TODO : pin version, at least we use the stable branch
          git clone -b stable  --single-branch --depth 1 git://git.videolan.org/x264 && \
          cd x264 && \
          ./configure --prefix="${SRC}" --bindir="${SRC}/bin" --enable-static && \
  
negative.code:         make && \
          make install && \
          make distclean && \
          rm -rf ${DIR} && \
  # # ffmpeg
          DIR=$(mktemp -d) && cd ${DIR} && \
          curl -s http://ffmpeg.org/releases/ffmpeg-${FFMPEG_VERSION}.tar.gz | \
          tar zxf - -C . && \
          cd ffmpeg-${FFMPEG_VERSION} && \
  