extern int PerlIO_setpos (PerlIO *,const Fpos_t *);
#endif
#ifndef PerlIO_fdupopen
-extern PerlIO * PerlIO_fdupopen (PerlIO *);
+#define PerlIO_fdupopen(f) (f)
+/* extern PerlIO * PerlIO_fdupopen (PerlIO *); */
#endif
#ifndef PerlIO_isutf8
extern int PerlIO_isutf8 (PerlIO *);