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diff --git a/source/blender/blenkernel/BKE_boids.h b/source/blender/blenkernel/BKE_boids.h
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+++ b/source/blender/blenkernel/BKE_boids.h
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+/*
+ * ***** BEGIN GPL LICENSE BLOCK *****
+ *
+ * This program 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.
+ *
+ * This program 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 this program; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ * The Original Code is Copyright (C) 2009 by Janne Karhu.
+ * All rights reserved.
+ *
+ * The Original Code is: all of this file.
+ *
+ * Contributor(s): none yet.
+ *
+ * ***** END GPL LICENSE BLOCK *****
+ */
+
+#ifndef __BKE_BOIDS_H__
+#define __BKE_BOIDS_H__
+
+/** \file BKE_boids.h
+ *  \ingroup bke
+ *  \since 2009
+ *  \author Janne Karhu
+ */
+
+#include "DNA_boid_types.h"
+
+struct RNG;
+
+typedef struct BoidBrainData {
+	struct ParticleSimulationData *sim;
+	struct ParticleSettings *part;
+	float timestep, cfra, dfra;
+	float wanted_co[3], wanted_speed;
+
+	/* Goal stuff */
+	struct Object *goal_ob;
+	float goal_co[3];
+	float goal_nor[3];
+	float goal_priority;
+
+	struct RNG *rng;
+} BoidBrainData;
+
+void boids_precalc_rules(struct ParticleSettings *part, float cfra);
+void boid_brain(BoidBrainData *bbd, int p, struct ParticleData *pa);
+void boid_body(BoidBrainData *bbd, struct ParticleData *pa);
+void boid_default_settings(BoidSettings *boids);
+BoidRule *boid_new_rule(int type);
+BoidState *boid_new_state(BoidSettings *boids);
+BoidState *boid_duplicate_state(BoidSettings *boids, BoidState *state);
+void boid_free_settings(BoidSettings *boids);
+BoidSettings *boid_copy_settings(BoidSettings *boids);
+BoidState *boid_get_current_state(BoidSettings *boids);
+#endif