anchor.diff:    --enable-gpl \
     --enable-version3 \
     --enable-frei0r \
  +  --enable-ladspa \
     --enable-fontconfig \
     --enable-gray \
     --enable-iconv \
  
positive.code:   harfbuzz-dev harfbuzz-static \
    fontconfig-dev fontconfig-static \
    frei0r-plugins-dev \
    vo-amrwbenc-dev vo-amrwbenc-static
  
  COPY --from=vmaf /usr/local/lib/pkgconfig/libvmaf.pc /usr/local/lib/pkgconfig/libvmaf.pc
  COPY --from=vmaf /usr/local/lib/libvmaf.a /usr/local/lib/libvmaf.a
  
negative.code:   frei0r: env.FREI0R_VERSION, \
    ffmpeg: env.FFMPEG_VERSION, \
    fftw: env.FFTW_VERSION, \
    ladspa: env.LADSPA_VERSION, \
    fontconfig: env.FONTCONFIG_VERSION, \
    libaom: env.AOM_VERSION, \
    libaribb24: env.LIBARIBB24_VERSION, \
  