--- Makefile.am.orig	2021-11-08 12:44:24.000000000 +0900
+++ Makefile.am	2021-12-23 09:23:13.400659000 +0900
@@ -168,7 +168,7 @@
 include qpb/subdir.am
 include fpm/subdir.am
 include grpc/subdir.am
-include tools/subdir.am
+# include tools/subdir.am
 
 include bgpd/subdir.am
 include bgpd/rfp-example/librfp/subdir.am