anchor.diff:  
     src = fetchurl {
       url = "mirror://gnome/sources/librsvg/${versionMajor}/${name}.tar.xz";
  -    sha256Url = "mirror://gnome/sources/librsvg/${versionMajor}/${name}.sha256sum";
  -    sha256 = "d48bcf6b03fa98f07df10332fb49d8c010786ddca6ab34cbba217684f533ff2e";
  +    hashOutput = false;
  +    sha256 = "e6f6c5cbecc405bb945c7cd15061276035ae3173bbb3bb25e8a916779c7f69cc";
     };
   
     buildInputs = [
  
positive.code:       -e "s#\$(GDK_PIXBUF_QUERYLOADERS)#GDK_PIXBUF_MODULEDIR=$GDK_PIXBUF/loaders \$(GDK_PIXBUF_QUERYLOADERS)#"
    '';
  
    meta = with lib; {
      description = "Scalable Vector Graphics (SVG) rendering library";
      homepage = https://wiki.gnome.org/Projects/LibRsvg;
  
negative.code:     boolEn;
  
    versionMajor = "2.40";
    versionMinor = "17";
    version = "${versionMajor}.${versionMinor}";
  in
  stdenv.mkDerivation rec {
  