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diff --git a/src/3rdparty/autotrace/thin-image.h b/src/3rdparty/autotrace/thin-image.h
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+++ b/src/3rdparty/autotrace/thin-image.h
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+/* thin-image.h: thin binary image
+
+   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. */
+
+#ifndef THIN_IMAGE_H
+#define THIN_IMAGE_H
+
+/*
+ * C code from the article
+ * "Efficient Binary Image Thinning using Neighborhood Maps"
+ * by Joseph M. Cychosz, 3ksnn64@ecn.purdue.edu
+ * in "Graphics Gems IV", Academic Press, 1994
+ */
+
+#include "bitmap.h"
+#include "color.h"
+#include "exception.h"
+
+void thin_image(at_bitmap * image, const at_color * bg_color, at_exception_type * exp);
+
+#endif /* not THIN_IMAGE_H */