-extern NCURSES_EXPORT(void) _nc_add_to_try (struct tries **, const char *, unsigned);
-extern NCURSES_EXPORT(char *) _nc_expand_try (struct tries *, unsigned, int *, size_t);
-extern NCURSES_EXPORT(int) _nc_remove_key (struct tries **, unsigned);
-extern NCURSES_EXPORT(int) _nc_remove_string (struct tries **, const char *);
+extern NCURSES_EXPORT(int) _nc_add_to_try (TRIES **, const char *, unsigned);
+extern NCURSES_EXPORT(char *) _nc_expand_try (TRIES *, unsigned, int *, size_t);
+extern NCURSES_EXPORT(int) _nc_remove_key (TRIES **, unsigned);
+extern NCURSES_EXPORT(int) _nc_remove_string (TRIES **, const char *);