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diff --git a/third_party/jpeg-xl/lib/jxl/simd_util.h b/third_party/jpeg-xl/lib/jxl/simd_util.h
new file mode 100644
index 0000000000..84938a931a
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+++ b/third_party/jpeg-xl/lib/jxl/simd_util.h
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+// Copyright (c) the JPEG XL Project Authors. All rights reserved.
+//
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+#ifndef LIB_JXL_SIMD_UTIL_H_
+#define LIB_JXL_SIMD_UTIL_H_
+#include <stddef.h>
+
+namespace jxl {
+
+// Maximal vector size in bytes.
+size_t MaxVectorSize();
+
+}  // namespace jxl
+
+#endif  // LIB_JXL_SIMD_UTIL_H_