anchor.diff:      libpng
       libraw
       librsvg
  +    libspiro
       libtiff
       libwebp
       openexr
  
positive.code:   passthru = {
      srcVerification = fetchurl {
        failEarly = true;
        sha1Urls = map (n: "${n}/../SHA1SUMS") src.urls;
        sha256Urls = map (n: "${n}/../SHA256SUMS") src.urls;
        inherit (src) urls outputHash outputHashAlgo;
      };
  
negative.code: { stdenv
  , fetchurl
  , lib
  
  , babl
  , cairo
  , exiv2
  , ffmpeg_3-4
  , gdk-pixbuf
  , gexiv2
  , glib
  