anchor.diff:  
   # has to be before theora
   FROM builder AS ogg
  -COPY --link --from=ogg_download /tmp/ogg/ /tmp/ogg/
  +COPY --from=ogg_download /tmp/ogg/ /tmp/ogg/
   RUN \
     cd ogg && \
     ./configure --disable-shared --enable-static && \
  
positive.code:   tar xf libxvid.tar.gz -C xvid --strip-components=1
  
  FROM builder AS xvid
  COPY --link --from=xvid_download /tmp/xvid/ /tmp/xvid/
  RUN \
    cd xvid/build/generic && \
    CFLAGS="$CFLAGS -fstrength-reduce -ffast-math" ./configure && \
  
negative.code:   tar xf dav1d.tar.gz -C dav1d --strip-components=1
  
  FROM builder AS dav1d
  COPY --from=dav1d_download /tmp/dav1d/ /tmp/dav1d/
  RUN \
    cd dav1d && meson build --buildtype release -Ddefault_library=static && \
    ninja -j$(nproc) -C build install
  