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#ifndef _ERRNO_H #define _ERRNO_H #include <features.h> #include <bits/errno.h> extern int sys_nerr; extern const char *const sys_errlist[]; #define _sys_nerr sys_nerr #define _sys_errlist sys_errlist #ifndef errno extern int errno; #endif extern void perror __P ((__const char* __s)); extern char* strerror __P ((int __errno)); #endif