From 62904093df82d42937014127ece5f6fa1ab51241 Mon Sep 17 00:00:00 2001
From: Bruno Haible <bruno@clisp.org>
Date: Fri, 23 Jun 2023 01:48:57 +0200
Subject: [PATCH] =?UTF-8?q?build:=20Ensure=20that=20makeinfo=20=E2=89=A5?=
 =?UTF-8?q?=206.8=20checks=20the=20@menu=20structure.?=
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See <https://lists.gnu.org/archive/html/bug-texinfo/2023-06/msg00015.html>.

* doc/Makefile.am (MAKEINFO): New variable.
---
 doc/Makefile.am | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/doc/Makefile.am b/doc/Makefile.am
index 47ce102b..403c40c4 100644
--- a/doc/Makefile.am
+++ b/doc/Makefile.am
@@ -26,6 +26,11 @@ man_MANS = $(srcdir)/m4.1
 EXTRA_DIST = $(man_MANS) gendocs_template
 MAINTAINERCLEANFILES = $(man_MANS) gendocs_template
 SUFFIXES = .1
+
+# The customization variable CHECK_NORMAL_MENU_STRUCTURE is necessary with
+# makeinfo versions ≥ 6.8.
+MAKEINFO = @MAKEINFO@ -c CHECK_NORMAL_MENU_STRUCTURE=1
+
 HELP2MAN = $(SHELL) $(top_srcdir)/build-aux/missing --run help2man
 
 # Depend on ../.version for version, m4.c for usage text.  Do not depend on
-- 
2.34.1