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diff --git a/src/3rdparty/autotrace/quantize.h b/src/3rdparty/autotrace/quantize.h
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+++ b/src/3rdparty/autotrace/quantize.h
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+/* quantize.h: Quantize a high color bitmap
+
+   Copyright (C) 2001, 2002 Martin Weber
+
+   This library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public License
+   as published by the Free Software Foundation; either version 2.1 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
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with this library; if not, write to the Free Software
+   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
+   USA. */
+
+#include "bitmap.h"
+#include "color.h"
+#include "exception.h"
+
+#ifndef QUANTIZE_H
+#define QUANTIZE_H
+
+#define PRECISION_R	7
+#define PRECISION_G	7
+#define PRECISION_B	7
+
+#define HIST_R_ELEMS	(1<<PRECISION_R)
+#define HIST_G_ELEMS	(1<<PRECISION_G)
+#define HIST_B_ELEMS	(1<<PRECISION_B)
+
+#define MR		HIST_G_ELEMS*HIST_B_ELEMS
+#define MG		HIST_B_ELEMS
+
+typedef unsigned long ColorFreq;
+typedef ColorFreq *Histogram;
+
+typedef struct {
+  int desired_number_of_colors; /* Number of colors we will allow */
+  int actual_number_of_colors;  /* Number of colors actually needed */
+  at_color cmap[256];           /* colormap created by quantization */
+  ColorFreq freq[256];
+  Histogram histogram;          /* holds the histogram */
+} QuantizeObj;
+
+void quantize(at_bitmap *, long ncolors, const at_color * bgColor, QuantizeObj **, at_exception_type * exp);
+
+void quantize_object_free(QuantizeObj * obj);
+#endif /* NOT QUANTIZE_H */