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diff --git a/lib/ktl/include-after/wchar.h b/lib/ktl/include-after/wchar.h
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+++ b/lib/ktl/include-after/wchar.h
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+// Copyright 2018 The Fuchsia Authors
+//
+// Use of this source code is governed by a MIT-style
+// license that can be found in the LICENSE file or at
+// https://opensource.org/licenses/MIT
+
+#ifndef ZIRCON_KERNEL_LIB_KTL_INCLUDE_AFTER_WCHAR_H_
+#define ZIRCON_KERNEL_LIB_KTL_INCLUDE_AFTER_WCHAR_H_
+
+#include <stddef.h>
+
+// The kernel doesn't want this file but some libc++ headers we need wind up
+// including it and they need these declarations.
+//
+// **NOTE** This file is include-after because libc++ headers get it via
+// #include_next so as to get the "system" <wchar.h> rather than libc++'s
+// own wrapper.
+
+typedef struct {
+} mbstate_t;
+
+typedef unsigned int wint_t;
+#define WEOF (~wint_t{0})
+
+// <string_view> refers to these in code that's never actually used in ktl.
+wchar_t* wmemcpy(wchar_t* __restrict, const wchar_t* __restrict, size_t);
+wchar_t* wmemmove(wchar_t*, const wchar_t*, size_t);
+wchar_t* wmemset(wchar_t*, wchar_t, size_t);
+
+#endif // ZIRCON_KERNEL_LIB_KTL_INCLUDE_AFTER_WCHAR_H_