anchor.diff:      libogg-dev \
       libtheora \
       libtheora-dev \
  -    libvpx \
  -    libvpx-dev \
  +#    libvpx \
  +#    libvpx-dev \
       libvorbis \
       libvorbis-dev \
  -    libwebp \
  -    libwebp-dev \
  +#    libwebp \
  +#    libwebp-dev \
       nasm \
       openssl \
       openssl-dev \
  
positive.code:   --enable-gpl \
    --enable-nonfree \
    --enable-small \
    --enable-libmp3lame \
    --enable-libx264 \
    --enable-libx265 \
    --enable-libvpx \
    --enable-libtheora \
    --enable-libvorbis \
    --enable-libopus \
    --enable-libfdk_aac \
    --enable-libass \
    --enable-libwebp \
    --enable-librtmp \
    --enable-postproc \
    --enable-avresample \
    --enable-libfreetype \
    --enable-openssl \
  
negative.code: RUN cd /tmp/ \
     && wget https://github.com/nkari82/mp4v2/archive/master.zip \
     && unzip master.zip \
     && rm master.zip \
     && cd mp4v2-master \
     && ./configure && make && make install && make distclean && rm -rf /tmp/*
  
  RUN cd /tmp/ \
     && wget https://github.com/nu774/fdkaac/archive/1.0.0.tar.gz \
     && tar xzf 1.0.0.tar.gz \
     && rm 1.0.0.tar.gz \
     && cd fdkaac-1.0.0 \
     && autoreconf -i && ./configure && make && make install && rm -rf /tmp/*
  
  RUN wget https://github.com/sandreas/m4b-tool/releases/download/v.${M4B_TOOL_VERSION}/m4b-tool.phar -O /usr/local/bin/m4b-tool \
      && chmod +x /usr/local/bin/m4b-tool
  
  CMD ["/bin/sh"]
  