diff --git a/make/topdir.mk b/make/topdir.mk
index 730fd5a5..58d682dd 100644
--- a/make/topdir.mk
+++ b/make/topdir.mk
@@ -151,3 +151,6 @@ prefix.done:
 	mkdir -p $(PREFIX)
 	touch $@
 
+echo-prereq-build:
+	@python $(MOD_SCRIPT_DIR)/projects.py $(PROJECTS_PY_EXTRA_ARGS) required-pkg $(RPM_PROJECT)
+