| Index: runtime/platform/thread_macos.h
 | 
| diff --git a/runtime/platform/thread_macos.h b/runtime/platform/thread_macos.h
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| index baf5a9c292cfede3a5f1753c0ed3d12f405771c5..a836dc31aa4f02ccfd1662386f3400e5913382c9 100644
 | 
| --- a/runtime/platform/thread_macos.h
 | 
| +++ b/runtime/platform/thread_macos.h
 | 
| @@ -5,6 +5,10 @@
 | 
|  #ifndef PLATFORM_THREAD_MACOS_H_
 | 
|  #define PLATFORM_THREAD_MACOS_H_
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|  
 | 
| +#if !defined(PLATFORM_THREAD_H_)
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| +#error Do not include thread_macos.h directly; use thread.h instead.
 | 
| +#endif
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| +
 | 
|  #include <pthread.h>
 | 
|  
 | 
|  #include "platform/globals.h"
 | 
| 
 |