--- build-root/Makefile.orig	2024-05-03 16:05:23 UTC
+++ build-root/Makefile
@@ -736,7 +736,7 @@ install_check_timestamp =					\
 
 .PHONY: %-install
 %-install: %-build
-	$(install_check_timestamp)
+	$(call build_msg_fn, external build removed)
 
 ######################################################################
 # Source code managment