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diff --git a/apps/systemlib/perf_counter.h b/apps/systemlib/perf_counter.h
deleted file mode 100644
index 5c2cb15b2..000000000
--- a/apps/systemlib/perf_counter.h
+++ /dev/null
@@ -1,128 +0,0 @@
-/****************************************************************************
- *
- *   Copyright (C) 2012 PX4 Development Team. All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- *
- * 1. Redistributions of source code must retain the above copyright
- *    notice, this list of conditions and the following disclaimer.
- * 2. 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.
- * 3. Neither the name PX4 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.
- *
- ****************************************************************************/
-
-/**
- * @file perf_counter.h
- * Performance measuring tools.
- */
-
-#ifndef _SYSTEMLIB_PERF_COUNTER_H
-#define _SYSTEMLIB_PERF_COUNTER_H value
-
-/**
- * Counter types.
- */
-enum perf_counter_type {
-	PC_COUNT,		/**< count the number of times an event occurs */
-	PC_ELAPSED,		/**< measure the time elapsed performing an event */
-	PC_INTERVAL		/**< measure the interval between instances of an event */
-};
-
-struct perf_ctr_header;
-typedef struct perf_ctr_header	*perf_counter_t;
-
-__BEGIN_DECLS
-
-/**
- * Create a new counter.
- *
- * @param type			The type of the new counter.
- * @param name			The counter name.
- * @return			Handle for the new counter, or NULL if a counter
- *				could not be allocated.
- */
-__EXPORT extern perf_counter_t	perf_alloc(enum perf_counter_type type, const char *name);
-
-/**
- * Free a counter.
- *
- * @param handle		The performance counter's handle.
- */
-__EXPORT extern void		perf_free(perf_counter_t handle);
-
-/**
- * Count a performance event.
- *
- * This call only affects counters that take single events; PC_COUNT etc.
- *
- * @param handle		The handle returned from perf_alloc.
- */
-__EXPORT extern void		perf_count(perf_counter_t handle);
-
-/**
- * Begin a performance event.
- *
- * This call applies to counters that operate over ranges of time; PC_ELAPSED etc.
- *
- * @param handle		The handle returned from perf_alloc.
- */
-__EXPORT extern void		perf_begin(perf_counter_t handle);
-
-/**
- * End a performance event.
- *
- * This call applies to counters that operate over ranges of time; PC_ELAPSED etc.
- *
- * @param handle		The handle returned from perf_alloc.
- */
-__EXPORT extern void		perf_end(perf_counter_t handle);
-
-/**
- * Reset a performance event.
- *
- * This call resets performance counter to initial state
- *
- * @param handle		The handle returned from perf_alloc.
- */
-__EXPORT extern void		perf_reset(perf_counter_t handle);
-
-/**
- * Print one performance counter.
- *
- * @param handle		The counter to print.
- */
-__EXPORT extern void		perf_print_counter(perf_counter_t handle);
-
-/**
- * Print all of the performance counters.
- */
-__EXPORT extern void		perf_print_all(void);
-
-/**
- * Reset all of the performance counters.
- */
-__EXPORT extern void		perf_reset_all(void);
-
-__END_DECLS
-
-#endif