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diff --git a/apps/plugins/doom/p_tick.h b/apps/plugins/doom/p_tick.h
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+/* Emacs style mode select   -*- C++ -*-
+ *-----------------------------------------------------------------------------
+ *
+ *
+ *  PrBoom a Doom port merged with LxDoom and LSDLDoom
+ *  based on BOOM, a modified and improved DOOM engine
+ *  Copyright (C) 1999 by
+ *  id Software, Chi Hoang, Lee Killough, Jim Flynn, Rand Phares, Ty Halderman
+ *  Copyright (C) 1999-2000 by
+ *  Jess Haas, Nicolas Kalkhof, Colin Phipps, Florian Schulze
+ *
+ *  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., 59 Temple Place - Suite 330, Boston, MA
+ *  02111-1307, USA.
+ *
+ * DESCRIPTION:
+ *  Core thinker processing prototypes.
+ *-----------------------------------------------------------------------------*/
+
+#ifndef __P_TICK__
+#define __P_TICK__
+
+#include "d_think.h"
+
+#ifdef __GNUG__
+#pragma interface
+#endif
+
+/* Called by C_Ticker, can call G_PlayerExited.
+ * Carries out all thinking of monsters and players. */
+
+void P_Ticker(void);
+
+extern thinker_t thinkercap;  // Both the head and tail of the thinker list
+
+void P_InitThinkers(void);
+void P_AddThinker(thinker_t *thinker);
+void P_RemoveThinker(thinker_t *thinker);
+void P_RemoveThinkerDelayed(thinker_t *thinker);    // killough 4/25/98
+
+void P_UpdateThinker(thinker_t *thinker);   // killough 8/29/98
+
+void P_SetTarget(mobj_t **mo, mobj_t *target);   // killough 11/98
+
+// killough 8/29/98: threads of thinkers, for more efficient searches
+typedef enum {
+   th_misc,
+   th_friends,
+   th_enemies,
+   NUMTHCLASS
+} th_class;
+
+extern thinker_t thinkerclasscap[];
+
+#endif