Update distclean for newer autoconf; add 'make release'
diff --git a/Makefile b/Makefile
index 6405771..9cdcd73 100644
--- a/Makefile
+++ b/Makefile
@@ -31,8 +31,13 @@
 	rm -f *.o *.i *.s version.h $(PROGS)
 
 distclean: clean
-	rm -f MCONFIG config.status config.cache config.log config.h *~ \#*
+	rm -f MCONFIG config.status config.log config.h *~ \#*
 	rm -f core *.orig *.rej
+	rm -rf *.cache
+
+release:
+	$(MAKE) configure
+	$(MAKE) distclean
 
 mkzftree: $(OBJS)
 	$(CC) $(LDFLAGS) -o mkzftree $(OBJS) $(LIBS)