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diff --git a/src/treegen.h b/src/treegen.h
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+++ b/src/treegen.h
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+/*
+Minetest-c55
+Copyright (C) 2010-2012 celeron55, Perttu Ahola <celeron55@gmail.com>,
+				   2012 RealBadAngel, Maciej Kasatkin <mk@realbadangel.pl>
+This program 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 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 Lesser General Public License for more details.
+
+You should have received a copy of the GNU Lesser 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.
+*/
+
+#ifndef TREEGEN_HEADER
+#define TREEGEN_HEADER
+
+#include <matrix4.h>
+
+class ManualMapVoxelManipulator;
+class INodeDefManager;
+
+
+namespace treegen
+{
+
+struct TreeDef
+{
+std::string initial_axiom;
+std::string rules_a;
+std::string rules_b;
+std::string rules_c;
+std::string rules_d;
+MapNode trunknode;
+MapNode leavesnode;
+int angle;
+int iterations;
+int iterations_random_level;
+bool thin_trunks;
+bool fruit_tree;
+MapNode fruitnode;
+};
+
+	// Add default tree
+	void make_tree(ManualMapVoxelManipulator &vmanip, v3s16 p0,
+			bool is_apple_tree, INodeDefManager *ndef);
+	
+	// Add L-Systems tree (used by engine)
+	void make_ltree(ManualMapVoxelManipulator &vmanip, v3s16 p0, INodeDefManager *ndef,
+		TreeDef tree_definition);
+	// Spawn L-systems tree from LUA
+	void spawn_ltree (ServerEnvironment *env, v3s16 p0, INodeDefManager *ndef, TreeDef tree_definition);	
+	
+	// L-System tree gen helper functions
+	void make_tree_node_placement(ManualMapVoxelManipulator &vmanip, v3f p0,
+		MapNode node);
+	void make_tree_trunk_placement(ManualMapVoxelManipulator &vmanip, v3f p0,
+		TreeDef &tree_definition);
+	void make_tree_leaves_placement(ManualMapVoxelManipulator &vmanip, v3f p0,
+		TreeDef &tree_definition);	
+	irr::core::matrix4 setRotationAxisRadians(irr::core::matrix4 M, double angle,v3f axis);
+	
+	v3f transposeMatrix(irr::core::matrix4 M ,v3f v);
+			
+}; // namespace treegen
+#endif