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diff --git a/libgimpmath/gimpvector.h b/libgimpmath/gimpvector.h
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+/* LIBGIMP - The GIMP Library
+ * Copyright (C) 1995-1997 Peter Mattis and Spencer Kimball
+ *
+ * gimpvector.h
+ *
+ * The gimp_vector* functions were taken from:
+ * GCK - The General Convenience Kit
+ * Copyright (C) 1996 Tom Bech
+ *
+ * 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 3 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, see
+ * <https://www.gnu.org/licenses/>.
+ */
+
+#if !defined (__GIMP_MATH_H_INSIDE__) && !defined (GIMP_MATH_COMPILATION)
+#error "Only <libgimpmath/gimpmath.h> can be included directly."
+#endif
+
+#ifndef __GIMP_VECTOR_H__
+#define __GIMP_VECTOR_H__
+
+G_BEGIN_DECLS
+
+/* For information look into the C source or the html documentation */
+
+
+/* Two dimensional vector functions */
+/* ================================ */
+
+GimpVector2 gimp_vector2_new (gdouble x,
+ gdouble y);
+void gimp_vector2_set (GimpVector2 *vector,
+ gdouble x,
+ gdouble y);
+gdouble gimp_vector2_length (const GimpVector2 *vector);
+gdouble gimp_vector2_length_val (GimpVector2 vector);
+void gimp_vector2_mul (GimpVector2 *vector,
+ gdouble factor);
+GimpVector2 gimp_vector2_mul_val (GimpVector2 vector,
+ gdouble factor);
+void gimp_vector2_normalize (GimpVector2 *vector);
+GimpVector2 gimp_vector2_normalize_val (GimpVector2 vector);
+void gimp_vector2_neg (GimpVector2 *vector);
+GimpVector2 gimp_vector2_neg_val (GimpVector2 vector);
+void gimp_vector2_add (GimpVector2 *result,
+ const GimpVector2 *vector1,
+ const GimpVector2 *vector2);
+GimpVector2 gimp_vector2_add_val (GimpVector2 vector1,
+ GimpVector2 vector2);
+void gimp_vector2_sub (GimpVector2 *result,
+ const GimpVector2 *vector1,
+ const GimpVector2 *vector2);
+GimpVector2 gimp_vector2_sub_val (GimpVector2 vector1,
+ GimpVector2 vector2);
+gdouble gimp_vector2_inner_product (const GimpVector2 *vector1,
+ const GimpVector2 *vector2);
+gdouble gimp_vector2_inner_product_val (GimpVector2 vector1,
+ GimpVector2 vector2);
+GimpVector2 gimp_vector2_cross_product (const GimpVector2 *vector1,
+ const GimpVector2 *vector2);
+GimpVector2 gimp_vector2_cross_product_val (GimpVector2 vector1,
+ GimpVector2 vector2);
+void gimp_vector2_rotate (GimpVector2 *vector,
+ gdouble alpha);
+GimpVector2 gimp_vector2_rotate_val (GimpVector2 vector,
+ gdouble alpha);
+GimpVector2 gimp_vector2_normal (GimpVector2 *vector);
+GimpVector2 gimp_vector2_normal_val (GimpVector2 vector);
+
+/* Three dimensional vector functions */
+/* ================================== */
+
+GimpVector3 gimp_vector3_new (gdouble x,
+ gdouble y,
+ gdouble z);
+void gimp_vector3_set (GimpVector3 *vector,
+ gdouble x,
+ gdouble y,
+ gdouble z);
+gdouble gimp_vector3_length (const GimpVector3 *vector);
+gdouble gimp_vector3_length_val (GimpVector3 vector);
+void gimp_vector3_mul (GimpVector3 *vector,
+ gdouble factor);
+GimpVector3 gimp_vector3_mul_val (GimpVector3 vector,
+ gdouble factor);
+void gimp_vector3_normalize (GimpVector3 *vector);
+GimpVector3 gimp_vector3_normalize_val (GimpVector3 vector);
+void gimp_vector3_neg (GimpVector3 *vector);
+GimpVector3 gimp_vector3_neg_val (GimpVector3 vector);
+void gimp_vector3_add (GimpVector3 *result,
+ const GimpVector3 *vector1,
+ const GimpVector3 *vector2);
+GimpVector3 gimp_vector3_add_val (GimpVector3 vector1,
+ GimpVector3 vector2);
+void gimp_vector3_sub (GimpVector3 *result,
+ const GimpVector3 *vector1,
+ const GimpVector3 *vector2);
+GimpVector3 gimp_vector3_sub_val (GimpVector3 vector1,
+ GimpVector3 vector2);
+gdouble gimp_vector3_inner_product (const GimpVector3 *vector1,
+ const GimpVector3 *vector2);
+gdouble gimp_vector3_inner_product_val (GimpVector3 vector1,
+ GimpVector3 vector2);
+GimpVector3 gimp_vector3_cross_product (const GimpVector3 *vector1,
+ const GimpVector3 *vector2);
+GimpVector3 gimp_vector3_cross_product_val (GimpVector3 vector1,
+ GimpVector3 vector2);
+void gimp_vector3_rotate (GimpVector3 *vector,
+ gdouble alpha,
+ gdouble beta,
+ gdouble gamma);
+GimpVector3 gimp_vector3_rotate_val (GimpVector3 vector,
+ gdouble alpha,
+ gdouble beta,
+ gdouble gamma);
+
+/* 2d <-> 3d Vector projection functions */
+/* ===================================== */
+
+void gimp_vector_2d_to_3d (gint sx,
+ gint sy,
+ gint w,
+ gint h,
+ gint x,
+ gint y,
+ const GimpVector3 *vp,
+ GimpVector3 *p);
+
+GimpVector3 gimp_vector_2d_to_3d_val (gint sx,
+ gint sy,
+ gint w,
+ gint h,
+ gint x,
+ gint y,
+ GimpVector3 vp,
+ GimpVector3 p);
+
+void gimp_vector_3d_to_2d (gint sx,
+ gint sy,
+ gint w,
+ gint h,
+ gdouble *x,
+ gdouble *y,
+ const GimpVector3 *vp,
+ const GimpVector3 *p);
+
+
+G_END_DECLS
+
+#endif /* __GIMP_VECTOR_H__ */