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diff --git a/lib/art/art_render_gradient.h b/lib/art/art_render_gradient.h
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+++ b/lib/art/art_render_gradient.h
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+/*
+ * art_render_gradient.h: Gradient image source for modular rendering.
+ *
+ * Libart_LGPL - library of basic graphic primitives
+ * Copyright (C) 2000 Raph Levien
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 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
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library 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.
+ *
+ * Authors: Raph Levien <raph@acm.org>
+ *          Alexander Larsson <alla@lysator.liu.se>
+ */
+
+#ifndef __ART_RENDER_GRADIENT_H__
+#define __ART_RENDER_GRADIENT_H__
+
+#ifdef LIBART_COMPILATION
+#include "art_filterlevel.h"
+#include "art_render.h"
+#else
+#include "art_filterlevel.h"
+#include "art_render.h"
+#endif
+
+#ifdef __cplusplus
+extern "C" {
+#endif /* __cplusplus */
+
+typedef struct _ArtGradientLinear ArtGradientLinear;
+typedef struct _ArtGradientRadial ArtGradientRadial;
+typedef struct _ArtGradientStop ArtGradientStop;
+
+typedef enum {
+  ART_GRADIENT_PAD,
+  ART_GRADIENT_REFLECT,
+  ART_GRADIENT_REPEAT
+} ArtGradientSpread;
+
+struct _ArtGradientLinear {
+  double a;
+  double b;
+  double c;
+  ArtGradientSpread spread;
+  int n_stops;
+  ArtGradientStop *stops;
+};
+
+struct _ArtGradientRadial {
+  double affine[6]; /* transforms user coordinates to unit circle */
+  double fx, fy;    /* focal point in unit circle coords */
+  int n_stops;
+  ArtGradientStop *stops;
+};
+
+struct _ArtGradientStop {
+  double offset;
+  ArtPixMaxDepth color[ART_MAX_CHAN + 1];
+};
+
+void
+art_render_gradient_linear (ArtRender *render,
+			    const ArtGradientLinear *gradient,
+			    ArtFilterLevel level);
+
+void
+art_render_gradient_radial (ArtRender *render,
+			    const ArtGradientRadial *gradient,
+			    ArtFilterLevel level);
+
+#ifdef __cplusplus
+}
+#endif /* __cplusplus */
+
+#endif /* __ART_RENDER_GRADIENT_H__ */