From d96c2ea4319e5e64d821cf6d494f811855514b24 Mon Sep 17 00:00:00 2001
From: "Barak A. Pearlmutter" <barak+git@pearlmutter.net>
Date: Wed, 28 Dec 2016 11:31:09 +0100
Subject: [PATCH] do gcc -std=c99 the autotools way

---
 configure.ac | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/configure.ac b/configure.ac
index 5c49040..2d4e90d 100644
--- a/configure.ac
+++ b/configure.ac
@@ -53,6 +53,9 @@ AC_DEFINE_UNQUOTED([GITREVISION],["${GITREVISION}"],
 # Checks for programs
 
 AC_PROG_CC
+AC_PROG_CC_STDC
+AS_IF([test "x${ac_cv_prog_cc_stdc}" = xno],
+      [AC_MSG_WARN([Unable to engage Standard C (C99) option])],)
 AC_PROG_INSTALL
 
 # Process options