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diff --git a/include/google/protobuf/port.h b/include/google/protobuf/port.h
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+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+// A common header that is included across all protobuf headers.  We do our best
+// to avoid #defining any macros here; instead we generally put macros in
+// port_def.inc and port_undef.inc so they are not visible from outside of
+// protobuf.
+
+#ifndef GOOGLE_PROTOBUF_PORT_H__
+#define GOOGLE_PROTOBUF_PORT_H__
+
+#include <cstddef>
+#include <new>
+
+
+namespace google {
+namespace protobuf {
+namespace internal {
+inline void SizedDelete(void* p, size_t size) {
+#if defined(__cpp_sized_deallocation)
+  ::operator delete(p, size);
+#else
+  ::operator delete(p);
+#endif
+}
+inline void SizedArrayDelete(void* p, size_t size) {
+#if defined(__cpp_sized_deallocation)
+  ::operator delete[](p, size);
+#else
+  ::operator delete[](p);
+#endif
+}
+
+// Tag type used to invoke the constinit constructor overload of classes
+// such as ArenaStringPtr and MapFieldBase. Such constructors are internal
+// implementation details of the library.
+struct ConstantInitialized {
+  explicit ConstantInitialized() = default;
+};
+
+// Tag type used to invoke the arena constructor overload of classes such
+// as ExtensionSet and MapFieldLite in aggregate initialization. These
+// classes typically don't have move/copy constructors, which rules out
+// explicit initialization in pre-C++17.
+struct ArenaInitialized {
+  explicit ArenaInitialized() = default;
+};
+
+}  // namespace internal
+}  // namespace protobuf
+}  // namespace google
+
+#endif  // GOOGLE_PROTOBUF_PORT_H__