From 3abb32c3ba7886e0bbb892d045fed66371b7e083 Mon Sep 17 00:00:00 2001
From: Florian Obser <florian@narrans.de>
Date: Fri, 15 Sep 2023 13:00:17 +0200
Subject: [PATCH] Check for c99 with autoconf versions prior to 2.70

---
 configure.ac | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/configure.ac b/configure.ac
index f6f5f21fc..9aa781a12 100644
--- a/configure.ac
+++ b/configure.ac
@@ -280,7 +280,7 @@ ACX_CHECK_COMPILER_FLAG(g, [CFLAGS="$CFLAGS -g"])
 ACX_CHECK_COMPILER_FLAG(O2, [CFLAGS="$CFLAGS -O2"])
 default_cflags=yes
 fi
-AC_PROG_CC
+m4_version_prereq([2.70], [AC_PROG_CC], [AC_PROG_CC_STDC])
 ACX_DEPFLAG
 ACX_DETERMINE_EXT_FLAGS_UNBOUND
 
-- 
2.39.5