From 15ada9d3a0e46c28c0a3af2357b64bbd14d818a8 Mon Sep 17 00:00:00 2001
From: Jannick <thirdedition@gmx.net>
Date: Tue, 3 Nov 2020 10:11:23 -0500
Subject: [PATCH] _AC_PROG_YYTEXT_DECL: Forward declare yywrap (#110312)
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Some versions of lex need you to forward-declare yywrap in a %{ %}
block before the rules section, if you’re going to define it yourself.

May help with bug #110312.

* lib/autoconf/programs.m4 (_AC_PROG_LEX_YYTEXT_DECL): In the test
  input to lex, forward-declare yywrap before the rules.
---
 lib/autoconf/programs.m4 | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/lib/autoconf/programs.m4 b/lib/autoconf/programs.m4
index e289a0185..b352ce244 100644
--- a/lib/autoconf/programs.m4
+++ b/lib/autoconf/programs.m4
@@ -746,6 +746,9 @@ fi])])
 # declares yytext as a char * by default.
 AC_DEFUN([_AC_PROG_LEX_YYTEXT_DECL],
 [cat >conftest.l <<_ACEOF[
+%{
+int yywrap(void);
+%}
 %%
 a { ECHO; }
 b { REJECT; }
-- 
2.47.3