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diff --git a/third_party/jpeg-xl/lib/jxl/common.h b/third_party/jpeg-xl/lib/jxl/common.h
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index 0000000000..d619711c9f
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+++ b/third_party/jpeg-xl/lib/jxl/common.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_COMMON_H_
+#define LIB_JXL_COMMON_H_
+
+// Shared constants.
+
+#include <cstddef>
+
+#ifndef JXL_HIGH_PRECISION
+#define JXL_HIGH_PRECISION 1
+#endif
+
+// Macro that defines whether support for decoding JXL files to JPEG is enabled.
+#ifndef JPEGXL_ENABLE_TRANSCODE_JPEG
+#define JPEGXL_ENABLE_TRANSCODE_JPEG 1
+#endif  // JPEGXL_ENABLE_TRANSCODE_JPEG
+
+// Macro that defines whether support for decoding boxes is enabled.
+#ifndef JPEGXL_ENABLE_BOXES
+#define JPEGXL_ENABLE_BOXES 1
+#endif  // JPEGXL_ENABLE_BOXES
+
+namespace jxl {
+// Some enums and typedefs used by more than one header file.
+
+// Maximum number of passes in an image.
+constexpr size_t kMaxNumPasses = 11;
+
+// Maximum number of reference frames.
+constexpr size_t kMaxNumReferenceFrames = 4;
+
+}  // namespace jxl
+
+#endif  // LIB_JXL_COMMON_H_