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diff --git a/libs/fluidsynth/fluidsynth/log.h b/libs/fluidsynth/fluidsynth/log.h
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+/* FluidSynth - A Software Synthesizer
+ *
+ * Copyright (C) 2003  Peter Hanappe and others.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public License
+ * as published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Library General Public License for more details.
+ *  
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the Free
+ * Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA
+ */
+
+#ifndef _FLUIDSYNTH_LOG_H
+#define _FLUIDSYNTH_LOG_H
+
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+
+/**
+ * @file log.h
+ * @brief Logging interface
+ *
+ * The default logging function of the fluidsynth prints its messages
+ * to the stderr. The synthesizer uses five level of messages: #FLUID_PANIC,
+ * #FLUID_ERR, #FLUID_WARN, #FLUID_INFO, and #FLUID_DBG.
+ *
+ * A client application can install a new log function to handle the
+ * messages differently. In the following example, the application
+ * sets a callback function to display #FLUID_PANIC messages in a dialog,
+ * and ignores all other messages by setting the log function to
+ * NULL:
+ *
+ * @code
+ *   fluid_set_log_function(FLUID_PANIC, show_dialog, (void*) root_window);
+ *   fluid_set_log_function(FLUID_ERR, NULL, NULL);
+ *   fluid_set_log_function(FLUID_WARN, NULL, NULL);
+ *   fluid_set_log_function(FLUID_DBG, NULL, NULL);
+ * @endcode
+ */
+
+/**
+ * FluidSynth log levels.
+ */
+enum fluid_log_level { 
+  FLUID_PANIC,   /**< The synth can't function correctly any more */
+  FLUID_ERR,     /**< Serious error occurred */
+  FLUID_WARN,    /**< Warning */
+  FLUID_INFO,    /**< Verbose informational messages */
+  FLUID_DBG,     /**< Debugging messages */
+  LAST_LOG_LEVEL
+};
+
+/**
+ * Log function handler callback type used by fluid_set_log_function().
+ * @param level Log level (#fluid_log_level)
+ * @param message Log message text
+ * @param data User data pointer supplied to fluid_set_log_function().
+ */
+typedef void (*fluid_log_function_t)(int level, char* message, void* data);
+
+FLUIDSYNTH_API 
+fluid_log_function_t fluid_set_log_function(int level, fluid_log_function_t fun, void* data);
+
+FLUIDSYNTH_API void fluid_default_log_function(int level, char* message, void* data);
+
+FLUIDSYNTH_API int fluid_log(int level, const char *fmt, ...);
+
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* _FLUIDSYNTH_LOG_H */