getopt_io_old.m:022: In clause for predicate `main'/2:
getopt_io_old.m:022:   error: wrong number of arguments (6; should be 4 or 5)
getopt_io_old.m:022:   in call to predicate `process_options'.
getopt_io_old.m:022:   One possible reason for the error is that the predicate
getopt_io_old.m:022:   in the `getopt_io' module that used to be named
getopt_io_old.m:022:   `process_options' has been renamed to
getopt_io_old.m:022:   `process_options_io'.