https://bugs.gentoo.org/934771
https://git.gnupg.org/cgi-bin/gitweb.cgi?p=pinentry.git;a=commit;h=a39ba412ab24721d4edb6476156371f8bf1d3ff9

From a39ba412ab24721d4edb6476156371f8bf1d3ff9 Mon Sep 17 00:00:00 2001
From: NIIBE Yutaka <gniibe@fsij.org>
Date: Fri, 28 Jul 2023 14:09:11 +0900
Subject: [PATCH] build: Update libassuan.m4 for libassuan version 3 in future.

* m4/libassuan.m4: Update from libassuan master.

--

New libassuan 3 has backward compatible API.

Signed-off-by: NIIBE Yutaka <gniibe@fsij.org>
--- a/m4/libassuan.m4
+++ b/m4/libassuan.m4
@@ -9,7 +9,7 @@ dnl This file is distributed in the hope that it will be useful, but
 dnl WITHOUT ANY WARRANTY, to the extent permitted by law; without even the
 dnl implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 dnl SPDX-License-Identifier: FSFULLR
-# Last-changed: 2022-11-01
+# Last-changed: 2023-07-26
 
 dnl
 dnl Common code used for libassuan detection [internal]
@@ -89,6 +89,7 @@ AC_DEFUN([_AM_PATH_LIBASSUAN_COMMON],
 
   if test $ok = yes; then
     AC_MSG_RESULT([yes ($libassuan_config_version)])
+    AC_DEFINE(LIBASSUAN_API_REQUESTED, $req_libassuan_api, Requested API version for libassuan)
   else
     AC_MSG_RESULT(no)
   fi
@@ -104,6 +105,8 @@ AC_DEFUN([_AM_PATH_LIBASSUAN_COMMON],
         AC_MSG_CHECKING([LIBASSUAN API version])
         if test "$req_libassuan_api" -eq "$tmp" ; then
           AC_MSG_RESULT(okay)
+        elif test "$req_libassuan_api" -eq 2 -a "$tmp" -eq 3; then
+          AC_MSG_RESULT(okay)
         else
           ok=no
           AC_MSG_RESULT([does not match.  want=$req_libassuan_api got=$tmp.])
-- 
2.30.2