anchor.diff:      php7-phar \
       pkgconf \
       pkgconfig \
  -#    rtmpdump \
  -#    rtmpdump-dev \
       tar \
       wget \
  -#    x264-dev \
  -#    x265-dev \
       yasm \
       yasm-dev \
       zlib-dev \
  
positive.code:     libogg-dev \
      libtheora \
      libtheora-dev \
  #    libvpx \
  #    libvpx-dev \
      libvorbis \
      libvorbis-dev \
  #    libwebp \
  #    libwebp-dev \
      nasm \
      openssl \
      openssl-dev \
  
negative.code:     freetype-dev \
      lame \
      lame-dev \
      libogg \
      libvpx \
      libogg-dev \
  