diff --git a/make/rules.mk b/make/rules.mk
index 37cf9a65..05540589 100644
--- a/make/rules.mk
+++ b/make/rules.mk
@@ -165,6 +165,7 @@ echo-prereq:
 	@echo PREREQ_BUILD      = $(sort $(PREREQ_BUILD))
 	@echo PREREQ_INSTALL    = $(sort $(PREREQ_INSTALL))
 	@echo PREREQ_RUN        = $(sort $(PREREQ_RUN))
+	@echo PREREQ            = $(sort $(PREREQ))
 
 echo-contrib: