anchor.diff:  
   gtksourceview_3-22 = callPackage ../all-pkgs/g/gtksourceview {
     channel = "3.22";
  -  atk = pkgs.atk_2-22;
  +  atk = pkgs.atk_2-24;
     gdk-pixbuf = pkgs.gdk-pixbuf_2-36;
     vala = pkgs.vala_0-34;
   };
  
positive.code: gnome-bluetooth_3-20 = callPackage ../all-pkgs/g/gnome-bluetooth {
    channel = "3.20";
    adwaita-icon-theme = pkgs.adwaita-icon-theme_3-24;
    atk = pkgs.atk_2-22;
    gdk-pixbuf = pkgs.gdk-pixbuf_2-36;
  };
  gnome-bluetooth = callPackageAlias "gnome-bluetooth_3-20" { };
  
negative.code: nautilus_3-22 = callPackage ../all-pkgs/n/nautilus {
    channel = "3.22";
    adwaita-icon-theme = pkgs.adwaita-icon-theme_3-24;
    atk = pkgs.atk_2-24;
    gdk-pixbuf = pkgs.gdk-pixbuf_2-36;
    gnome-desktop = pkgs.gnome-desktop_3-22;
    gsettings-desktop-schemas = pkgs.gsettings-desktop-schemas_3-24;
  