--- /dev/null
+--- a/ncurses/curses.priv.h
++++ b/ncurses/curses.priv.h
+@@ -54,6 +54,10 @@ extern "C" {
+
+ #include <ncurses_cfg.h>
+
++#if NEED_WCHAR_H
++#include <wchar.h>
++#endif
++
+ #if USE_RCS_IDS
+ #define MODULE_ID(id) static const char Ident[] = id;
+ #else