-Lisp_Object make_fixed_buffer_input_stream (const void *buf, size_t size);
-Lisp_Object make_fixed_buffer_output_stream (void *buf, size_t size);
-const unsigned char *fixed_buffer_input_stream_ptr (Lstream *stream);
+Lisp_Object make_fixed_buffer_input_stream (CONST unsigned char *buf,
+ size_t size);
+Lisp_Object make_fixed_buffer_output_stream (unsigned char *buf,
+ size_t size);
+CONST unsigned char *fixed_buffer_input_stream_ptr (Lstream *stream);