-categoricals_create (const struct variable **v, size_t n_vars,
- const struct variable *wv, enum mv_class exclude)
+categoricals_create (const struct variable *const *v, size_t n_vars,
+ const struct variable *wv, enum mv_class exclude,
+ user_data_create_func *udf,
+ update_func *update, void *aux1, void *aux2
+ )