anchor.diff:  { stdenv, fetchurl, pkgconfig, intltool, gnupg, p11-kit, glib
   , libgcrypt, libtasn1, dbus-glib, gtk, pango, gdk_pixbuf, atk
  -, gobjectIntrospection, makeWrapper, libxslt, vala, gnome3 }:
  +, gobjectIntrospection, makeWrapper, libxslt, vala, gnome3
  +, python2 }:
   
   stdenv.mkDerivation rec {
     name = "gcr-${version}";
  
positive.code: 
    propagatedBuildInputs = [ glib gtk p11-kit ];
  
    #doCheck = true;
  
    #enableParallelBuilding = true; issues on hydra
  
  
negative.code:     updateScript = gnome3.updateScript { packageName = "gcr"; attrPath = "gnome3.gcr"; };
    };
  
    postPatch = ''
      patchShebangs .
    '';
  
    outputs = [ "out" "dev" ];
  
    nativeBuildInputs = [ pkgconfig intltool gobjectIntrospection libxslt makeWrapper vala ];
  