https://github.com/heimdal/heimdal/pull/1229

From 2b372170c894ed9aa3fe2fca976f3541ea7041d9 Mon Sep 17 00:00:00 2001
From: Bernd Kuhls <bernd@kuhls.net>
Date: Sat, 10 Feb 2024 09:33:48 +0100
Subject: [PATCH] cf/largefile.m4: Fix build with autoconf-2.72

Fixes https://github.com/heimdal/heimdal/issues/1201
--- a/cf/largefile.m4
+++ b/cf/largefile.m4
@@ -10,7 +10,7 @@ dnl with generated code, such as lex
 if test "$enable_largefile" != no -a "$ac_cv_sys_large_files" != no; then
 	CPPFLAGS="$CPPFLAGS -D_LARGE_FILES=$ac_cv_sys_large_files"
 fi
-if test "$enable_largefile" != no -a "$ac_cv_sys_file_offset_bits" != no; then
+if test "$enable_largefile" != no -a "$ac_cv_sys_file_offset_bits" != no && test -n "$ac_cv_sys_file_offset_bits"; then
 	CPPFLAGS="$CPPFLAGS -D_FILE_OFFSET_BITS=$ac_cv_sys_file_offset_bits"
 fi
 ])