# Use our own Bison to build the parser. Of course, you ought to
# keep a sane version of Bison nearby...
-YACC = $(top_builddir)/tests/bison -y
+BISON = $(top_builddir)/tests/bison
+YACC = $(BISON) -y
AM_YFLAGS = -dv --warnings=all,error --report=all
bin_PROGRAMS = src/bison