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diff --git a/xtract/xtract_stateful.h b/xtract/xtract_stateful.h
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-/*
- * Copyright (C) 2012 Jamie Bullock
- *
- * Permission is hereby granted, free of charge, to any person obtaining a copy
- * of this software and associated documentation files (the "Software"), to
- * deal in the Software without restriction, including without limitation the
- * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
- * sell copies of the Software, and to permit persons to whom the Software is
- * furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included in
- * all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
- * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
- * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
- * IN THE SOFTWARE.
- *
- */
-
-/** \file xtract_stateful.h: declares functions that extract features that require stateful data to be retained between frames */
-#ifndef XTRACT_STATEFUL_H
-#define XTRACT_STATEFUL_H
-
-#ifdef __cplusplus
-extern "C" {
-#endif
-
-/**
- * \defgroup stateful feature extraction functions and data structures
- *
- * Functions that extract a feature over multiple frames
- *
- * @{
- */
-
-
-#include <stdint.h>
-#include <string.h>
-
-typedef struct xtract_last_n_state_ xtract_last_n_state;
-
-xtract_last_n_state *xtract_last_n_state_new(size_t capacity);
-void xtract_last_n_state_delete(xtract_last_n_state *last_n_state);
-
-
-/**
- * Write a vector of the last N input values to `result`
- *
- * @param state a pointer to an xtract_peak_picker_state struct as allocated by xtract_peak_picker_state_new()
- * @param data a pointer to a double representing the current input value
- * @param N an integer representing 'N' the number of values to be written to *result
- * @param argv a pointer to NULL
- * @param result a pointer to an array of doubles representing the last N values, where the nth value is the current one. The array must have been allocated to size N elements and initialised by the caller
- *
- */
-int xtract_last_n(const xtract_last_n_state *state, const double *data, const int N, const void *argv, double *result);
-
-#ifdef __cplusplus
-}
-#endif
-
-#endif