-ADD_ACKNOWLEDGER (Metronome_mark_engraver, break_aligned);
-ADD_ACKNOWLEDGER (Metronome_mark_engraver, break_alignment);
-ADD_ACKNOWLEDGER (Metronome_mark_engraver, grob);
+
+void
+Metronome_mark_engraver::boot ()
+{
+ ADD_LISTENER (Metronome_mark_engraver, tempo_change);
+ ADD_ACKNOWLEDGER (Metronome_mark_engraver, break_aligned);
+ ADD_ACKNOWLEDGER (Metronome_mark_engraver, break_alignment);
+ ADD_ACKNOWLEDGER (Metronome_mark_engraver, grob);
+}