+AM_CFLAGS += $(WARN_CFLAGS)
+
+# Implementation of bitsets.
+bitsets_sources = \
+ abitset.c abitset.h bbitset.h bitset.c bitset.h bitset_stats.c \
+ bitset_stats.h bitsetv.c bitsetv.h ebitset.c ebitset.h lbitset.c \
+ lbitset.h libiberty.h vbitset.c vbitset.h
+
+# Additional bitset operations.
+additional_bitsets_sources = \
+ bitsetv-print.h bitsetv-print.c
+
+# timevars, stolen from GCC.
+timevars_sources = \
+ timevar.h timevar.c timevar.def
+
+# Non-gnulib sources in Bison's internal library.
+libbison_a_SOURCES += \
+ get-errno.h get-errno.c \
+ $(bitsets_sources) $(additional_bitsets_sources) $(timevars_sources)
+
+# The Yacc compatibility library.
+lib_LIBRARIES = $(YACC_LIBRARY)
+EXTRA_LIBRARIES = liby.a
+liby_a_SOURCES = main.c yyerror.c