- NULL, /* field validation function */
- NULL, /* Character check function */
- NULL, /* enumerate next function */
- NULL /* enumerate previous function */
+ INIT_FT_FUNC(NULL), /* field validation function */
+ INIT_FT_FUNC(NULL), /* Character check function */
+ INIT_FT_FUNC(NULL), /* enumerate next function */
+ INIT_FT_FUNC(NULL), /* enumerate previous function */
+#if NCURSES_INTEROP_FUNCS
+ NULL /* generic callback alternative to makearg */
+#endif