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diff --git a/src/r_fps.h b/src/r_fps.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, Andrey Budko
+ *  Copyright 2005, 2006 by
+ *  Florian Schulze, Colin Phipps, Neil Stevens, Andrey Budko
+ *
+ *  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:
+ *      Uncapped framerate stuff
+ *
+ *---------------------------------------------------------------------
+ */
+
+#ifndef __R_FPS__
+#define __R_FPS__
+
+#include "doomstat.h"
+
+extern int movement_smooth;
+
+typedef struct {
+  fixed_t viewx;
+  fixed_t viewy;
+  fixed_t viewz;
+  angle_t viewangle;
+  angle_t viewpitch;
+} view_vars_t;
+
+extern view_vars_t original_view_vars;
+
+typedef struct {
+  unsigned int start;
+  unsigned int next;
+  unsigned int step;
+  fixed_t frac;
+  float msec;
+} tic_vars_t;
+
+extern tic_vars_t tic_vars;
+
+void R_InitInterpolation(void);
+void R_InterpolateView (player_t *player, fixed_t frac);
+
+extern boolean WasRenderedInTryRunTics;
+
+void R_ResetViewInterpolation ();
+void R_UpdateInterpolations();
+void R_StopAllInterpolations(void);
+void R_DoInterpolations(fixed_t smoothratio);
+void R_RestoreInterpolations();
+void R_ActivateSectorInterpolations();
+void R_ActivateThinkerInterpolations(thinker_t *th);
+void R_StopInterpolationIfNeeded(thinker_t *th);
+
+#endif