anchor.diff:  
   in stdenv.mkDerivation rec {
     pname = "cups-filters";
  -  version = "1.25.12";
  +  version = "1.28.10";
   
     src = fetchurl {
       url = "https://openprinting.org/download/cups-filters/${pname}-${version}.tar.xz";
  -    sha256 = "1kv25011iyzvd33n5zmmn1z2p6pzk26hmmw6qvjjnx8p3sp7raqn";
  +    sha256 = "sha256-z4yQRpTETPaJtXJORtI9qa5RJdVDdLNAxkIHfMKcqDc=";
     };
   
     nativeBuildInputs = [ pkg-config makeWrapper ];
  
positive.code:     "--enable-imagefilters"
      "--with-rcdir=no"
      "--with-shell=${stdenv.shell}"
      "--with-test-font-path=/path-does-not-exist"
    ];
  
    makeFlags = [ "CUPS_SERVERBIN=$(out)/lib/cups" "CUPS_DATADIR=$(out)/share/cups" "CUPS_SERVERROOT=$(out)/etc/cups" ];
  
negative.code:     '';
  
    enableParallelBuilding = true;
    doCheck = true;
  
    meta = {
      homepage = "http://www.linuxfoundation.org/collaborate/workgroups/openprinting/cups-filters";
  