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diff --git a/src/lib/eval/eval_log.h b/src/lib/eval/eval_log.h
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+// Copyright (C) 2015-2018 Internet Systems Consortium, Inc. ("ISC")
+//
+// 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 http://mozilla.org/MPL/2.0/.
+
+#ifndef EVAL_LOG_H
+#define EVAL_LOG_H
+
+#include <log/macros.h>
+#include <eval/eval_messages.h>
+
+namespace isc {
+namespace dhcp {
+
+/// @brief Eval debug Logging levels
+///
+/// Defines the levels used to output debug messages in the eval (classification) code.
+/// Note that higher numbers equate to more verbose (and detailed) output.
+
+// The first level traces normal operations,
+extern const int EVAL_DBG_TRACE;
+
+// Additional information on the calls.  Report the values that were
+// popped from or pushed to the value stack.
+extern const int EVAL_DBG_STACK;
+
+/// @brief Eval Logger
+///
+/// Define the logger used to log messages.  We could define it in multiple
+/// modules, but defining in a single module and linking to it saves time and
+/// space.
+extern isc::log::Logger eval_logger;
+
+} // namespace dhcp
+} // namespace isc
+
+#endif // EVAL_LOG_H