diff --git a/make/depend.mk b/make/depend.mk
index 1a7d1a69..d2f80dcf 100644
--- a/make/depend.mk
+++ b/make/depend.mk
@@ -35,5 +35,10 @@ endif
 .%.o.dep.mk: %.c $(BUILD_HDR)
 	$(CC) -M $(BUILD_CFLAGS) $(DEPEND_CPPFLAGS) $< -o $@
 
+show-vars: show-vars-depend-mk
+show-vars-depend-mk:
+	@echo DEPEND_MK = $(DEPEND_MK)
+	@echo BUILD_HDR = $(BUILD_HDR)
+
 endif # DEPEND_MK_INCLUDED
 DEPEND_MK_INCLUDED := true