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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