extern FILE *fdopen(int fd, const char *modes);
extern FILE *tmpfile(void);
extern int fclose(FILE *fp);
-extern void fflush(FILE *fp);
+extern int fflush(FILE *fp);
extern off_t ftell(FILE *fp);
extern off_t ftello(FILE *fp);
extern int fseek(FILE *fp, long int amt, int whence);