diff -Naur a/bc/Makefile.am b/bc/Makefile.am
 --- a/bc/Makefile.am	2017-04-07 13:09:29.000000000 -0700
 +++ b/bc/Makefile.am	2018-11-14 14:49:51.457915578 -0800
 @@ -31,14 +31,6 @@
  
  fbcOBJ = main.o bc.o scan.o execute.o load.o storage.o util.o warranty.o
  
 -libmath.h: libmath.b $(fbcOBJ) $(LIBBC)
 -	echo '{0}' > libmath.h
 -	$(MAKE) global.o
 -	$(LINK) -o fbc $(fbcOBJ) global.o $(LIBBC) $(LIBL) $(READLINELIB) $(LIBS)
 -	./fbc -c $(srcdir)/libmath.b </dev/null >libmath.h
 -	$(srcdir)/fix-libmath_h
 -	rm -f ./fbc ./global.o
 -
  sbcOBJ = main.o sbc.o scan.o execute.o global.o load.o storage.o util.o \
           warranty.o
  sbc.o: sbc.c