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diff --git a/lib/isc/include/isc/deprecated.h b/lib/isc/include/isc/deprecated.h
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+/*
+ * Copyright (C) Internet Systems Consortium, Inc. ("ISC")
+ *
+ * SPDX-License-Identifier: MPL-2.0
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, you can obtain one at https://mozilla.org/MPL/2.0/.
+ *
+ * See the COPYRIGHT file distributed with this work for additional
+ * information regarding copyright ownership.
+ */
+
+#pragma once
+
+#if (__GNUC__ + 0) > 3
+#define ISC_DEPRECATED __attribute__((deprecated))
+#else /* if (__GNUC__ + 0) > 3 */
+#define ISC_DEPRECATED /* none */
+#endif /* __GNUC__ > 3*/