| Index: runtime/bin/io_service.h
 | 
| diff --git a/runtime/bin/io_service.h b/runtime/bin/io_service.h
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| index c165e900379c0830109efc410268e5576f511576..209561a637f590e586feccf02e9bf7c86c997796 100644
 | 
| --- a/runtime/bin/io_service.h
 | 
| +++ b/runtime/bin/io_service.h
 | 
| @@ -5,6 +5,10 @@
 | 
|  #ifndef BIN_IO_SERVICE_H_
 | 
|  #define BIN_IO_SERVICE_H_
 | 
|  
 | 
| +#if defined(DART_IO_DISABLED) || defined(DART_IO_SECURE_SOCKET_DISABLED)
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| +#error "io_service.h can only be included on builds with IO and SSL enabled"
 | 
| +#endif
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| +
 | 
|  #include "bin/builtin.h"
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|  #include "bin/utils.h"
 | 
|  
 | 
| 
 |