--- a/third_party/libjingle/source/talk/base/sigslot.h
+++ b/third_party/libjingle/source/talk/base/sigslot.h
@@ -80,6 +80,7 @@
 
 #include <set>
 #include <list>
+#include <cstddef>
 
 // On our copy of sigslot.h, we force single threading
 #define SIGSLOT_PURE_ISO
--- a/third_party/ots/src/os2.cc
+++ b/third_party/ots/src/os2.cc
@@ -5,6 +5,7 @@
 #include "os2.h"
 
 #include "head.h"
+#include <cstddef>
 
 // OS/2 - OS/2 and Windows Metrics
 // http://www.microsoft.com/opentype/otspec/os2.htm