anchor.diff:      ++ optional speexSupport       speex
       ++ optional bs2bSupport        libbs2b
       ++ optional openalSupport      openalSoft
  -    ++ optional (openalSupport && stdenv.isDarwin) darwin.apple_sdk.frameworks.OpenAL
       ++ optional libpngSupport      libpng
       ++ optional youtubeSupport     youtube-dl
       ++ optional sdl2Support        SDL2
  
positive.code:     sha256 = "0i2nl65diqsjyz28dj07h6d8gq6ix72ysfm0nhs8514hqccaihs3";
    };
  
    postPatch = ''
      patchShebangs ./TOOLS/
    '';
  
negative.code: , youtubeSupport     ? true,  youtube-dl    ? null
  , vaapiSupport       ? true,  libva         ? null
  , drmSupport         ? true,  libdrm        ? null
  , openalSupport      ? false, openalSoft    ? null
  , vapoursynthSupport ? false, vapoursynth   ? null
  , archiveSupport     ? false, libarchive    ? null
  , jackaudioSupport   ? false, libjack2      ? null
  