--- /dev/null
+#ifndef __wint_t_defined
+#define __wint_t_defined 1
+
+/* Some versions of stddef.h provide wint_t, even though neither the
+ C nor C++ standards, nor POSIX, specifies this. We assume that
+ stddef.h will define the macro _WINT_T if and only if it provides
+ wint_t, and conversely, that it will avoid providing wint_t if
+ _WINT_T is already defined. */
+#ifndef _WINT_T
+#define _WINT_T 1
+
+/* Integral type unchanged by default argument promotions that can
+ hold any value corresponding to members of the extended character
+ set, as well as at least one value that does not correspond to any
+ member of the extended character set. */
+#ifndef __WINT_TYPE__
+# define __WINT_TYPE__ unsigned int
+#endif
+
+typedef __WINT_TYPE__ wint_t;
+
+#endif /* _WINT_T */
+#endif /* bits/types/wint_t.h */