-ADD_END_ACKNOWLEDGER (Spanner_break_forbid_engraver, unbreakable_spanner);
-ADD_ACKNOWLEDGER (Spanner_break_forbid_engraver, unbreakable_spanner);
+void
+Spanner_break_forbid_engraver::boot ()
+{
+ ADD_END_ACKNOWLEDGER (Spanner_break_forbid_engraver, unbreakable_spanner);
+ ADD_ACKNOWLEDGER (Spanner_break_forbid_engraver, unbreakable_spanner);
+}
+