anchor.diff:  
   with stdenv.lib;
   
  -python2Packages.buildPythonApplication rec {
  +python3Packages.buildPythonApplication rec {
     name = "virt-manager-${version}";
  -  version = "1.5.1";
  +  version = "2.0.0";
     namePrefix = "";
   
     src = fetchurl {
       url = "http://virt-manager.org/download/sources/virt-manager/${name}.tar.gz";
  -    sha256 = "1ardmd4sxdmd57y7qpka44gf09c1yq2g0xs074d3k1h925crv27f";
  +    sha256 = "1b48xbrx99mfiv80c60k3ydzkpcpbq57c8h8dl0gnffmnzbs8vzb";
     };
   
     nativeBuildInputs = [
  
positive.code:   '';
  
    postConfigure = ''
      ${python2Packages.python.interpreter} setup.py configure --prefix=$out
    '';
  
    postInstall = ''
  
negative.code:       gsettings-desktop-schemas libosinfo gtk3
      ] ++ optional spiceSupport spice-gtk;
  
    propagatedBuildInputs = with python3Packages;
      [
        pygobject3 ipaddress libvirt libxml2 requests
      ];
  
    patchPhase = ''
  