From fbb34761a3e3bc1befaaa1e07808371473216304 Mon Sep 17 00:00:00 2001
From: smlng <s@mlng.net>
Date: Tue, 16 Jan 2018 11:07:19 +0100
Subject: [PATCH] examples/posix_sockets: fix undefined usleep

---
 examples/posix_sockets/udp.c | 5 +++++
 tests/posix_time/main.c      | 5 +++++
 2 files changed, 10 insertions(+)

diff --git a/examples/posix_sockets/udp.c b/examples/posix_sockets/udp.c
index ecf30bf6e8..b49edf9fc6 100644
--- a/examples/posix_sockets/udp.c
+++ b/examples/posix_sockets/udp.c
@@ -18,6 +18,11 @@
  * @}
  */
 
+/* needed for posix usleep */
+#ifndef _XOPEN_SOURCE
+#define _XOPEN_SOURCE 600
+#endif
+
 #include <inttypes.h>
 #include <stdio.h>
 #include <stdlib.h>
diff --git a/tests/posix_time/main.c b/tests/posix_time/main.c
index 5c94cbefb5..e79fbced2b 100644
--- a/tests/posix_time/main.c
+++ b/tests/posix_time/main.c
@@ -19,6 +19,11 @@
  * @}
  */
 
+/* needed for posix usleep */
+#ifndef _XOPEN_SOURCE
+#define _XOPEN_SOURCE 600
+#endif
+
 #include <stdio.h>
 #include <unistd.h>