-#if __STDC__
-void error (int, int, const char *, ...) \
- __attribute__ ((format (printf, 3, 4)));
-#else
+# if defined (__STDC__) && __STDC__
+
+/* Print a message with `fprintf (stderr, FORMAT, ...)';
+ if ERRNUM is nonzero, follow it with ": " and strerror (ERRNUM).
+ If STATUS is nonzero, terminate the program with `exit (STATUS)'. */
+
+extern void error (int status, int errnum, const char *format, ...)
+ __attribute__ ((__format__ (__printf__, 3, 4)));
+
+extern void error_at_line (int status, int errnum, const char *fname,
+ unsigned int lineno, const char *format, ...)
+ __attribute__ ((__format__ (__printf__, 5, 6)));
+
+/* If NULL, error will flush stdout, then print on stderr the program
+ name, a colon and a space. Otherwise, error will call this
+ function without parameters instead. */
+extern void (*error_print_progname) (void);
+
+# else