#if !defined(_POSIX_C_SOURCE) || defined(_DARWIN_C_SOURCE)
-#ifndef _SIZE_T
-#define _SIZE_T
-typedef __darwin_size_t size_t;
-#endif
-
-#ifndef _CT_RUNE_T
-#define _CT_RUNE_T
-typedef __darwin_ct_rune_t ct_rune_t;
-#endif
-
-#ifndef _RUNE_T
-#define _RUNE_T
-typedef __darwin_rune_t rune_t;
-#endif
-
-#ifndef __cplusplus
-#ifndef _WCHAR_T
-#define _WCHAR_T
-typedef __darwin_wchar_t wchar_t;
-#endif /* _WCHAR_T */
-#endif /* __cplusplus */
-
-#ifndef _WINT_T
-#define _WINT_T
-typedef __darwin_wint_t wint_t;
-#endif
+#include <sys/_types/_size_t.h>
+#include <sys/_types/_ct_rune_t.h>
+#include <sys/_types/_rune_t.h>
+#include <sys/_types/_wchar_t.h>
+#include <sys/_types/_wint_t.h>
#endif /* (!_POSIX_C_SOURCE || _DARWIN_C_SOURCE) */