automake has warnings, it is ok here.

--- configure.ac.orig	2021-04-26 07:17:12 UTC
+++ configure.ac
@@ -63,7 +63,7 @@ AC_CANONICAL_HOST
 AC_CANONICAL_TARGET
 
 AC_CONFIG_SRCDIR([bin/named/main.c])
-AM_INIT_AUTOMAKE([1.9 tar-pax foreign subdir-objects dist-xz no-dist-gzip -Wall -Werror])
+AM_INIT_AUTOMAKE([1.9 tar-pax foreign subdir-objects dist-xz no-dist-gzip -Wall])
 AM_SILENT_RULES([yes])
 AM_EXTRA_RECURSIVE_TARGETS([test unit doc])