From bd63a31aabd06325c0894f18edc1b4e4b076d347 Mon Sep 17 00:00:00 2001
From: James Zern <jzern@google.com>
Date: Fri, 30 Sep 2016 00:15:44 -0700
Subject: [PATCH] vwebp: ensure setenv() is available in stdlib.h

quiets a -Wimplicit-function-declaration with some configurations of gcc
(-std=c99).
_POSIX_C_SOURCE is preferred over _BSD_SOURCE with newer versions of
glibc

Change-Id: I378bffb13ba52ff5c4bad1433090dcc387e5d507
(cherry picked from commit bfab894739cd73af8629131a7fd7b79a98e74455)
---
 examples/vwebp.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/examples/vwebp.c b/examples/vwebp.c
index 96525afc..67a0750d 100644
--- a/examples/vwebp.c
+++ b/examples/vwebp.c
@@ -14,6 +14,10 @@
 #include "webp/config.h"
 #endif
 
+#if defined(__unix__) || defined(__CYGWIN__)
+#define _POSIX_C_SOURCE 200112L  // for setenv
+#endif
+
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>