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