-ADD_ACKNOWLEDGER (Paper_column_engraver, item);
-ADD_ACKNOWLEDGER (Paper_column_engraver, note_spacing);
-ADD_ACKNOWLEDGER (Paper_column_engraver, staff_spacing);
+
+void
+Paper_column_engraver::boot ()
+{
+ ADD_LISTENER (Paper_column_engraver, break);
+ ADD_LISTENER (Paper_column_engraver, label);
+ ADD_ACKNOWLEDGER (Paper_column_engraver, item);
+ ADD_ACKNOWLEDGER (Paper_column_engraver, note_spacing);
+ ADD_ACKNOWLEDGER (Paper_column_engraver, staff_spacing);
+}