#define PerlIO_get_cnt(f) ((f)->endr - (f)->next)
#define PerlIO_canset_cnt(f) 1
#define PerlIO_fast_gets(f) 1
-#define PerlIO_set_ptrcnt(f,p,c) ((f)->next = (p))
+#define PerlIO_set_ptrcnt(f,p,c) ((f)->next = (unsigned char *)(p))
#define PerlIO_set_cnt(f,c) 1
#define PerlIO_has_base(f) 1