anchor.diff:      gnome-backgrounds = pkgs.gnome-backgrounds_3-22;
       gobject-introspection = pkgs.gobject-introspection_1-50;
     };
  -gsettings-desktop-schemas = callPackage ../all-pkgs/g/gsettings-desktop-schemas { };
  +gsettings-desktop-schemas =
  +  callPackageAlias "gsettings-desktop-schemas_3-20" { };
   
   gsm = callPackage ../all-pkgs/g/gsm { };
   
  
positive.code:   atk = pkgs.atk_2-22;
    gdk-pixbuf = pkgs.gdk-pixbuf_2-36;
    gobject-introspection = pkgs.gobject-introspection_1-50;
    gsettings-desktop-schemas = gsettings-desktop-schemas_3-22;
    gtk = pkgs.gtk_3-22;
  };
  gnome-desktop = callPackageAlias "gnome-desktop_3-20" { };
  
negative.code:   atk = pkgs.atk_2-20;
    gdk-pixbuf = pkgs.gdk-pixbuf_2-34;
    gobject-introspection = pkgs.gobject-introspection_1-48;
    gsettings-desktop-schemas = pkgs.gsettings-desktop-schemas_3-20;
    gtk = pkgs.gtk_3-20;
  };
  gnome-desktop_3-22 = callPackage ../all-pkgs/g/gnome-desktop {
  