anchor.diff:  
     enableParallelBuilding = true;
   
  -  nativeBuildInputs = [ pkgconfig autoconf ];
  +  nativeBuildInputs = [ pkg-config autoconf ];
     buildInputs =
       [ zlib expat openssl
         libjpeg libpng libtiff freetype fontconfig libpaper jbig2dec
  
positive.code: in
  stdenv.mkDerivation rec {
    pname = "ghostscript";
    inherit version;
  
    src = fetchurl {
      url = "https://github.com/ArtifexSoftware/ghostpdl-downloads/releases/download/gs9${ver_min}${ver_patch}/${pname}-${version}.tar.xz";
      inherit sha512;
    };
  
    patches = [
  
negative.code: assert cupsSupport -> cups != null;
  
  let
    fonts = stdenv.mkDerivation {
      name = "ghostscript-fonts";
  
  