anchor.diff:  
     src = fetchurl {
       url = "mirror://gnome/sources/gtk+/${lib.versions.majorMinor version}/gtk+-${version}.tar.xz";
  -    sha256 = "1sgizys2bdvdrv9msx3p8s6iwcyqzxamq4dxd9dx45ddbkfb5h9c";
  +    sha256 = "09ksflq5j257bf5zn8q2nnf2flicg9qqgfy7za79z7rkf1shc77p";
     };
   
     patches = [
  
positive.code: 
  stdenv.mkDerivation rec {
    pname = "gtk+3";
    version = "3.24.26";
  
    outputs = [ "out" "dev" ] ++ lib.optional withGtkDoc "devdoc";
    outputBin = "dev";
  
negative.code:     '';
      homepage = "https://www.gtk.org/";
      license = licenses.lgpl2Plus;
      maintainers = with maintainers; [ raskin ] ++ teams.gnome.members;
      platforms = platforms.all;
      changelog = "https://gitlab.gnome.org/GNOME/gtk/-/raw/${version}/NEWS";
    };
  