Index: src/OFFile.m
==================================================================
--- src/OFFile.m
+++ src/OFFile.m
@@ -13,15 +13,14 @@
  * LICENSE.GPLv2 or LICENSE.GPLv3 respectively included in the packaging of this
  * file.
  */
 
 #define _POSIX_C_SOURCE 200112L
-#define _XOPEN_SOURCE 500
-
-#include "config.h"
-
+#define _XOPEN_SOURCE 600
 #define __NO_EXT_QNX
+
+#include "config.h"
 
 /* Work around a bug with Clang + glibc */
 #ifdef __clang__
 # define _HAVE_STRING_ARCH_strcmp
 #endif

Index: src/OFThread.m
==================================================================
--- src/OFThread.m
+++ src/OFThread.m
@@ -13,11 +13,11 @@
  * LICENSE.GPLv2 or LICENSE.GPLv3 respectively included in the packaging of this
  * file.
  */
 
 #define OF_THREAD_M
-#define _POSIX_C_SOURCE 199309L
+#define _POSIX_C_SOURCE 200112L
 #define __NO_EXT_QNX
 
 #include "config.h"
 
 #include <stdlib.h>