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diff --git a/src/mapgen_flat.h b/src/mapgen_flat.h
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+/*
+Minetest
+Copyright (C) 2010-2015 kwolekr, Ryan Kwolek <kwolekr@minetest.net>
+Copyright (C) 2010-2015 paramat, Matt Gregory
+
+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 MAPGEN_FLAT_HEADER
+#define MAPGEN_FLAT_HEADER
+
+#include "mapgen.h"
+
+/////// Mapgen Flat flags
+#define MGFLAT_LAKES 0x01
+#define MGFLAT_HILLS 0x02
+
+class BiomeManager;
+
+extern FlagDesc flagdesc_mapgen_flat[];
+
+
+struct MapgenFlatParams : public MapgenSpecificParams {
+	u32 spflags;
+
+	s16 ground_level;
+	s16 large_cave_depth;
+	float lake_threshold;
+	float lake_steepness;
+	float hill_threshold;
+	float hill_steepness;
+
+	NoiseParams np_terrain;
+	NoiseParams np_filler_depth;
+	NoiseParams np_cave1;
+	NoiseParams np_cave2;
+
+	MapgenFlatParams();
+	~MapgenFlatParams() {}
+
+	void readParams(const Settings *settings);
+	void writeParams(Settings *settings) const;
+};
+
+class MapgenFlat : public Mapgen {
+public:
+	EmergeManager *m_emerge;
+	BiomeManager *bmgr;
+
+	int ystride;
+	int zstride;
+	u32 spflags;
+
+	v3s16 node_min;
+	v3s16 node_max;
+	v3s16 full_node_min;
+	v3s16 full_node_max;
+
+	s16 ground_level;
+	s16 large_cave_depth;
+	float lake_threshold;
+	float lake_steepness;
+	float hill_threshold;
+	float hill_steepness;
+
+	Noise *noise_terrain;
+	Noise *noise_filler_depth;
+	Noise *noise_cave1;
+	Noise *noise_cave2;
+
+	Noise *noise_heat;
+	Noise *noise_humidity;
+	Noise *noise_heat_blend;
+	Noise *noise_humidity_blend;
+
+	content_t c_stone;
+	content_t c_water_source;
+	content_t c_lava_source;
+	content_t c_desert_stone;
+	content_t c_ice;
+	content_t c_sandstone;
+
+	content_t c_cobble;
+	content_t c_stair_cobble;
+	content_t c_mossycobble;
+	content_t c_sandstonebrick;
+	content_t c_stair_sandstonebrick;
+
+	MapgenFlat(int mapgenid, MapgenParams *params, EmergeManager *emerge);
+	~MapgenFlat();
+
+	virtual void makeChunk(BlockMakeData *data);
+	int getGroundLevelAtPoint(v2s16 p);
+	void calculateNoise();
+	s16 generateTerrain();
+	MgStoneType generateBiomes(float *heat_map, float *humidity_map);
+	void dustTopNodes();
+	void generateCaves(s16 max_stone_y);
+};
+
+struct MapgenFactoryFlat : public MapgenFactory {
+	Mapgen *createMapgen(int mgid, MapgenParams *params, EmergeManager *emerge)
+	{
+		return new MapgenFlat(mgid, params, emerge);
+	};
+
+	MapgenSpecificParams *createMapgenParams()
+	{
+		return new MapgenFlatParams();
+	};
+};
+
+#endif