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diff --git a/rtrlib/lib/log_private.h b/rtrlib/lib/log_private.h
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+/*
+ * This file is part of RTRlib.
+ *
+ * This file is subject to the terms and conditions of the MIT license.
+ * See the file LICENSE in the top level directory for more details.
+ *
+ * Website: http://rtrlib.realmv6.org/
+ */
+
+#ifndef LRTR_LOG_PRIVATE_H
+#define LRTR_LOG_PRIVATE_H
+
+/**
+ * @brief Writes a message to stdout if NDEBUG isn't defined.
+ * @param[in] frmt log message in printf format style.
+ */
+void lrtr_dbg(const char *frmt, ...) __attribute__((format(printf, 1, 2)));
+
+#endif