+# Update version, then recompile so that tests/bison --version be
+# up-to-date, then compile our parser again with our up-to-date bison.
+.PHONY: regen
+regen: _version
+ $(MAKE) $(AM_MAKEFLAGS)
+ touch $(srcdir)/src/parse-gram.y
+ $(MAKE) $(AM_MAKEFLAGS)
+