# define BIO_new_fp BIO_new_fp_internal
# else /* FP_API */
BIO_METHOD *BIO_s_file(void );
-BIO *BIO_new_file(char *filename, char *mode);
+BIO *BIO_new_file(const char *filename, const char *mode);
BIO *BIO_new_fp(FILE *stream, int close_flag);
# define BIO_s_file_internal BIO_s_file
# define BIO_new_file_internal BIO_new_file