struct dirent *readdir(DIR *);
int readdir_r(DIR *__restrict, struct dirent *__restrict, struct dirent **__restrict);
void rewinddir(DIR *);
-void seekdir(DIR *, long);
-long telldir(DIR *);
int dirfd(DIR *);
int alphasort(const struct dirent **, const struct dirent **);
int scandir(const char *, struct dirent ***, int (*)(const struct dirent *), int (*)(const struct dirent **, const struct dirent **));
+#if defined(_XOPEN_SOURCE) || defined(_GNU_SOURCE) || defined(_BSD_SOURCE)
+void seekdir(DIR *, long);
+long telldir(DIR *);
+#endif
+
#if defined(_GNU_SOURCE) || defined(_BSD_SOURCE)
#define DT_UNKNOWN 0
#define DT_FIFO 1