--- a/Makefile	2008-10-30 14:20:02.000000000 +0000
+++ a/Makefile	2010-09-03 03:47:51.880837257 +0000
@@ -10,13 +10,15 @@ 
 
 all: $(ALL)
 
-btt/btt:
+.PHONY: all btreplay.make
+
+btt/btt: $(PROGS)
 	$(MAKE) -C btt
 
-btreplay/btrecord:
-	$(MAKE) -C btreplay
+btreplay/btrecord: btreplay.make
+btreplay/btreplay: btreplay.make
 
-btreplay/btreplay:
+btreplay.make:
 	$(MAKE) -C btreplay
 
 %.o: %.c