anchor.diff:  
       buildInputs = [
         glib
  -      gnome-bluetooth_1_0
  +      gnome-bluetooth
         gnome-desktop
         gsettings-desktop-schemas
         gtk3
  
positive.code: 
      src = fetchurl {
        url = "mirror://gnome/sources/${pname}/${lib.versions.majorMinor version}/${name}.tar.xz";
        sha256 = "sha256-flUlRhAtuqH9f2t/JEYx53N+MSX1OkcBnRog+Jh0++U=";
      };
  
      # make .desktop Execs absolute
  
negative.code:       -Exec=gnome-flashback
        +Exec=$out/bin/gnome-flashback
        END_PATCH
      '';
  
      postInstall = ''
  