diff --git a/make/rules.mk b/make/rules.mk
index 4059db44..6a8b8628 100644
--- a/make/rules.mk
+++ b/make/rules.mk
@@ -5,6 +5,9 @@
 
 all: $(ALL)
 
+echo_all:
+	@echo "$(ALL)"
+
 all.done: $(PREREQ_DONE) all
 	touch $@