-parse_long_options (int argc, char **argv, const char *command_name,
- const char *package, const char *version,
- void (*usage_func)())
+parse_long_options (int argc,
+ char **argv,
+ const char *command_name,
+ const char *package,
+ const char *version,
+ void (*usage_func) (int),
+ /* const char *author1, ...*/ ...)