https://bugs.gentoo.org/554338
https://rt.openssl.org/Ticket/Display.html?id=3934&user=guest&pass=guest

From 7c2e97f8bbae517496fdc11f475b4ae54b2534f5 Mon Sep 17 00:00:00 2001
From: Mike Frysinger <vapier@gentoo.org>
Date: Fri, 10 Jul 2015 01:50:52 -0400
Subject: [PATCH] test: use _DEFAULT_SOURCE with newer glibc versions

The _BSD_SOURCE macro is replaced by the _DEFAULT_SOURCE macro.  Using
just the former with newer versions leads to a build time warning, so
make sure to use the new macro too.
---
 ssl/ssltest.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/ssl/ssltest.c b/ssl/ssltest.c
index 26cf96c..b36f667 100644
--- a/ssl/ssltest.c
+++ b/ssl/ssltest.c
@@ -141,6 +141,7 @@
  */
 
 /* Or gethostname won't be declared properly on Linux and GNU platforms. */
+#define _DEFAULT_SOURCE 1
 #define _BSD_SOURCE 1
 
 #include <assert.h>
-- 
2.4.4