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diff --git a/src/lingot-fft.h b/src/lingot-fft.h
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+//-*- C++ -*-
+/*
+ * lingot, a musical instrument tuner.
+ *
+ * Copyright (C) 2004-2007  Ibán Cereijo Graña, Jairo Chapela Martínez.
+ *
+ * This file is part of lingot.
+ *
+ * lingot is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * lingot 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 General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with lingot; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#ifndef _LINGOT_FFT_H_
+#define _LINGOT_FFT_H_
+
+/*
+ Fourier transforms.
+ */
+
+#include "lingot-defs.h"
+
+#ifndef LIB_FFTW
+
+#  include "lingot-complex.h"
+#  include "lingot-config.h"
+
+void lingot_fft_create_phase_factors(LingotConfig* conf);
+void lingot_fft_destroy_phase_factors();
+
+// Fast Fourier Transform implementation.
+void lingot_fft_fft(FLT* in, LingotComplex* out, unsigned long int N);
+
+#endif // not LIB_FFTW
+
+// Spectral Power Distribution (SPD) esteem, selectively in frequency.
+void lingot_fft_spd(FLT* in, int N1, FLT wi, FLT dw, FLT* out, int N2);
+
+// first and second SPD derivatives at frequency w.
+void lingot_fft_spd_diffs(FLT* in, int N, FLT w, FLT* out_d1, FLT* out_d2);
+
+#endif