--- ./media/webrtc/trunk/src/system_wrappers/source/cpu_info.cc.orig
+++ ./media/webrtc/trunk/src/system_wrappers/source/cpu_info.cc
@@ -21,6 +21,7 @@
 // Not implemented yet, might be possible to use Linux implementation
 #else // defined(WEBRTC_LINUX)
 #include <sys/sysinfo.h>
+#include <unistd.h>
 #endif
 
 #include "trace.h"