--- mozilla-release.orig/media/webrtc/trunk/webrtc/modules/audio_device/linux/audio_mixer_manager_alsa_linux.cc	2013-09-11 01:15:17.000000000 +0200
+++ mozilla-release/media/webrtc/trunk/webrtc/modules/audio_device/linux/audio_mixer_manager_alsa_linux.cc	2013-10-23 16:28:38.000000000 +0200
@@ -8,6 +8,8 @@
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
+#define _POSIX_SOURCE
+
 #include <cassert>
 
 #include "audio_mixer_manager_alsa_linux.h"
