anchor.diff:        This library can only compress, not decompress. Existing zlib or
         deflate libraries can decompress the data.
       '';
  -    platforms = platforms.linux;
  +    platforms = platforms.unix;
       license = licenses.asl20;
       maintainers = with maintainers; [ bobvanderlinden nckx ];
     };
  
positive.code:       name = "zopfli-bug-and-typo-fixes.patch";
        url = "https://github.com/google/zopfli/commit/7190e08ecac2446c7c9157cfbdb7157b18912a92.patch";
      })
    ];
  
    enableParallelBuilding = false; # problems, easily reproducible
    buildFlags = [
      "zopfli"
      "libzopfli"
      "zopflipng"
      "libzopflipng"
    ];
  
    installPhase = ''
      mkdir -p $out/bin
      install -m755 zopfli{,png} $out/bin
  
      mkdir -p $out/lib
      install -m755 libzopfli{,png}.so* $out/lib
  
      mkdir -p $out/share/doc/zopfli
      install -m644 README* $out/share/doc/zopfli
    '';
  
    meta = with stdenv.lib; {
      inherit (src.meta) homepage;
  
negative.code: { stdenv, fetchFromGitHub, fetchpatch, cmake }:
  
  stdenv.mkDerivation rec {
    name = "zopfli-${version}";
  