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Override the default yacc rule for make.

    This prevents yacc from being called multiple times.

--- a/mk/lexyacc.mk

+++ b/mk/lexyacc.mk

@@ -1,9 +1,7 @@

 NECFLAGS = $(subst -Werror,,$(subst -Wall,,$(CFLAGS)))

-%.o: %.y

+%.c: %.y

 	yacc -dt -o$*.c $<

-	$(CC) -c $(NECFLAGS) $*.c

-%.o: %.l

+%.c: %.l

 	flex -o$*.c $<

-	$(CC) -c $(NECFLAGS) $*.c