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1.1 nbrk 1: #ifndef NULL 2: #if !defined(__GNUG__) || __GNUG__ < 2 || (__GNUG__ == 2 && __GNUC_MINOR__ < 90) 3: #if !defined(__cplusplus) 4: #define NULL (void *)0 5: #else 6: #define NULL 0 7: #endif /* !__cplusplus */ 8: #else 9: #define NULL __null 10: #endif 11: #endif