From: Florian Obser <florian@narrans.de>
Date: Fri, 15 Sep 2023 11:00:17 +0000 (+0200)
Subject: Check for c99 with autoconf versions prior to 2.70
X-Git-Tag: release-1.19.0rc1~45^2
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=refs%2Fpull%2F936%2Fhead;p=thirdparty%2Funbound.git

Check for c99 with autoconf versions prior to 2.70
---

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