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:   buildInputs = [
      cups poppler poppler_utils fontconfig libjpeg libpng perl
      ijs qpdf dbus avahi ghostscript mupdf
    ];
  
    configureFlags = [
  
negative.code: { lib, stdenv, fetchurl, pkg-config, cups, poppler, poppler_utils, fontconfig
  , libjpeg, libpng, perl, ijs, qpdf, dbus, avahi
  , makeWrapper, coreutils, gnused, bc, gawk, gnugrep, which, ghostscript
  , mupdf, dejavu_fonts, liblouis
  }:
  
  let
  