-ADD_ACKNOWLEDGER (Ligature_bracket_engraver, rest);
-ADD_ACKNOWLEDGER (Ligature_bracket_engraver, note_column);
+
+void
+Ligature_bracket_engraver::boot ()
+{
+ ADD_LISTENER (Ligature_bracket_engraver, ligature);
+ ADD_ACKNOWLEDGER (Ligature_bracket_engraver, rest);
+ ADD_ACKNOWLEDGER (Ligature_bracket_engraver, note_column);
+}