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diff --git a/engines/pegasus/ai/ai_condition.h b/engines/pegasus/ai/ai_condition.h
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+/* ScummVM - Graphic Adventure Engine
+ *
+ * ScummVM is the legal property of its developers, whose names
+ * are too numerous to list here. Please refer to the COPYRIGHT
+ * file distributed with this source distribution.
+ *
+ * Additional copyright for this file:
+ * Copyright (C) 1995-1997 Presto Studios, Inc.
+ *
+ * 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.
+ *
+ */
+
+#ifndef PEGASUS_AI_AICONDITION_H
+#define PEGASUS_AI_AICONDITION_H
+
+#include "pegasus/timers.h"
+
+namespace Common {
+	class ReadStream;
+	class WriteStream;
+}
+
+namespace Pegasus {
+
+/////////////////////////////////////////////
+//
+// AICondition
+
+class AICondition {
+public:
+	AICondition() {}
+	virtual ~AICondition() {}
+
+	virtual bool fireCondition() = 0;
+
+	// Only need these for conditions that are dynamic, like timer conditions...
+	// other conditions, like item related conditions, which don't change during
+	// the run of an environment, are completely initted when the environment
+	// is created.
+	virtual void writeAICondition(Common::WriteStream *) {}
+	virtual void readAICondition(Common::ReadStream *) {}
+};
+
+/////////////////////////////////////////////
+//
+// AIOneChildCondition
+
+class AIOneChildCondition : public AICondition {
+public:
+	AIOneChildCondition(AICondition *);
+	virtual ~AIOneChildCondition();
+
+	virtual void writeAICondition(Common::WriteStream *);
+	virtual void readAICondition(Common::ReadStream *);
+
+protected:
+	AICondition *_child;
+};
+
+/////////////////////////////////////////////
+//
+// AITwoChildrenCondition
+
+class AITwoChildrenCondition : public AICondition {
+public:
+	AITwoChildrenCondition(AICondition *, AICondition *);
+	virtual ~AITwoChildrenCondition();
+
+	virtual void writeAICondition(Common::WriteStream *);
+	virtual void readAICondition(Common::ReadStream *);
+
+protected:
+	AICondition *_leftChild, *_rightChild;
+};
+
+/////////////////////////////////////////////
+//
+// AINotCondition
+
+class AINotCondition : public AIOneChildCondition {
+public:
+	AINotCondition(AICondition *);
+
+	virtual bool fireCondition();
+};
+
+/////////////////////////////////////////////
+//
+// AIAndCondition
+
+class AIAndCondition : public AITwoChildrenCondition {
+public:
+	AIAndCondition(AICondition *, AICondition *);
+
+	virtual bool fireCondition();
+};
+
+/////////////////////////////////////////////
+//
+// AIOrCondition
+
+class AIOrCondition : public AITwoChildrenCondition {
+public:
+	AIOrCondition(AICondition *, AICondition *);
+
+	virtual bool fireCondition();
+};
+
+/////////////////////////////////////////////
+//
+// AITimerCondition
+
+class AITimerCondition : public AICondition {
+public:
+	AITimerCondition(const TimeValue, const TimeScale, const bool);
+
+	void startTimer();
+	void stopTimer();
+
+	virtual bool fireCondition();
+
+	virtual void writeAICondition(Common::WriteStream *);
+	virtual void readAICondition(Common::ReadStream *);
+
+protected:
+	void fire();
+
+	FuseFunction _timerFuse;
+	bool _fired;
+};
+
+/////////////////////////////////////////////
+//
+// AILocationCondition
+
+class AILocationCondition : public AICondition {
+public:
+	AILocationCondition(uint32);
+	virtual ~AILocationCondition();
+
+	void addLocation(RoomViewID);
+	virtual bool fireCondition();
+
+	virtual void writeAICondition(Common::WriteStream *);
+	virtual void readAICondition(Common::ReadStream *);
+
+protected:
+	uint32 _numLocations, _maxLocations;
+	RoomViewID *_locations;
+};
+
+/////////////////////////////////////////////
+//
+// AIDoorOpenedCondition
+
+class AIDoorOpenedCondition : public AICondition {
+public:
+	AIDoorOpenedCondition(RoomViewID);
+	virtual ~AIDoorOpenedCondition() {}
+
+	virtual bool fireCondition();
+
+protected:
+	RoomViewID _doorLocation;
+};
+
+/////////////////////////////////////////////
+//
+// AIHasItemCondition
+
+class AIHasItemCondition : public AICondition {
+public:
+	AIHasItemCondition(const ItemID);
+
+	virtual bool fireCondition();
+
+protected:
+	ItemID _item;
+};
+
+/////////////////////////////////////////////
+//
+// AIDoesntHaveItemCondition
+
+class AIDoesntHaveItemCondition : public AICondition {
+public:
+	AIDoesntHaveItemCondition(const ItemID);
+
+	virtual bool fireCondition();
+
+protected:
+	ItemID _item;
+};
+
+/////////////////////////////////////////////
+//
+// AICurrentItemCondition
+
+class AICurrentItemCondition : public AICondition {
+public:
+	AICurrentItemCondition(const ItemID);
+
+	virtual bool fireCondition();
+
+protected:
+	ItemID _item;
+};
+
+/////////////////////////////////////////////
+//
+// AICurrentBiochipCondition
+
+class AICurrentBiochipCondition : public AICondition {
+public:
+	AICurrentBiochipCondition(const ItemID);
+
+	virtual bool fireCondition();
+
+protected:
+	ItemID _biochip;
+};
+
+/////////////////////////////////////////////
+//
+// AIItemStateCondition
+
+class AIItemStateCondition : public AICondition {
+public:
+	AIItemStateCondition(const ItemID, const ItemState);
+
+	virtual bool fireCondition();
+
+protected:
+	ItemID _item;
+	ItemState _state;
+};
+
+/////////////////////////////////////////////
+//
+// AIEnergyMonitorCondition
+
+class AIEnergyMonitorCondition : public AICondition {
+public:
+	AIEnergyMonitorCondition(const int32);
+
+	virtual bool fireCondition();
+
+protected:
+	int32 _energyThreshold;
+};
+
+/////////////////////////////////////////////
+//
+// AILastExtraCondition
+
+class AILastExtraCondition : public AICondition {
+public:
+	AILastExtraCondition(const ExtraID);
+
+	virtual bool fireCondition();
+
+protected:
+	ExtraID _lastExtra;
+};
+
+/////////////////////////////////////////////
+//
+// Helper functions
+
+AICondition *makeLocationAndDoesntHaveItemCondition(const RoomID room, const DirectionConstant direction, const ItemID item);
+
+} // End of namespace Pegasus
+
+#endif