| Index: runtime/bin/socket_macos.h
 | 
| diff --git a/runtime/bin/socket_macos.h b/runtime/bin/socket_macos.h
 | 
| index b77857c87d93af32b8e83ffc6a735d5c23cd7689..dce6d9710b4cde3842f67d6c9f844d413446833f 100644
 | 
| --- a/runtime/bin/socket_macos.h
 | 
| +++ b/runtime/bin/socket_macos.h
 | 
| @@ -5,6 +5,10 @@
 | 
|  #ifndef BIN_SOCKET_MACOS_H_
 | 
|  #define BIN_SOCKET_MACOS_H_
 | 
|  
 | 
| +#if !defined(BIN_SOCKET_H_)
 | 
| +#error Do not include socket_macos.h directly. Use socket.h.
 | 
| +#endif
 | 
| +
 | 
|  #include <arpa/inet.h>
 | 
|  #include <netdb.h>
 | 
|  #include <sys/socket.h>
 | 
| 
 |