-ADD_ACKNOWLEDGER (Ledger_line_engraver, ledgered);
-ADD_ACKNOWLEDGER (Ledger_line_engraver, staff_symbol);
+void
+Ledger_line_engraver::boot ()
+{
+ ADD_ACKNOWLEDGER (Ledger_line_engraver, ledgered);
+ ADD_ACKNOWLEDGER (Ledger_line_engraver, staff_symbol);
+}
+