anchor.diff:        wkennington
       ];
       platforms = with platforms;
  -      i686-linux
  -      ++ x86_64-linux;
  +      x86_64-linux;
     };
   }
  
positive.code:   patches = [
      (fetchurl {
        url = "mirror://sourceforge/libpng-apng/libpng-${version}-apng.patch.gz";
        sha256 = "0wwcc52yzjaxvpfkicz20j7yzpy02hpnsm4jjlvw74gy4qjhx9vd";
      })
    ];
  
    meta = with stdenv.lib; {
      description = "The official reference implementation for the PNG file format with animation patch";
  
negative.code: 
  stdenv.mkDerivation rec {
    name = "libpng-${version}";
    version = "1.6.22";
  
    src = fetchurl {
      url = "mirror://sourceforge/libpng/libpng-${version}.tar.xz";
      allowHashOutput = false;
      multihash = "QmU3V85XU2KWpwXQzwSUbekrcgvXJFsKHttBQwwrrpAcaX";
      sha256 = "6b5a6ad5c5801ec4d24aacc87a0ed7b666cd586478174f69368a1d7747715226";
    };
  
    buildInputs = [
  