anchor.diff:  
   stdenv.mkDerivation rec {
     pname = "gegl";
  -  version = "0.4.38";
  +  version = "0.4.40";
   
     outputs = [ "out" "dev" "devdoc" ];
     outputBin = "dev";
   
     src = fetchurl {
       url = "https://download.gimp.org/pub/gegl/${lib.versions.majorMinor version}/${pname}-${version}.tar.xz";
  -    sha256 = "sha256-5KM8hDClBC+6hDm1lTSOcYcPDZX7+IX/VT+QIMG+11A=";
  +    sha256 = "zd6A0VpJ2rmmFO+Y+ATIzm5M/hM5o8JAw08/tFQ2uF0=";
     };
   
     nativeBuildInputs = [
  
positive.code: , glib
  , babl
  , libpng
  , cairo
  , libjpeg
  , librsvg
  
negative.code:     luajit
      openexr
      suitesparse
    ] ++ lib.optionals stdenv.isDarwin [
      OpenCL
    ] ++ lib.optionals stdenv.cc.isClang [
      llvmPackages.openmp
    ];
  
    # for gegl-4.0.pc
    propagatedBuildInputs = [
  