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diff --git a/extern/libmv/libmv/autotrack/frame_accessor.h b/extern/libmv/libmv/autotrack/frame_accessor.h
deleted file mode 100644
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--- a/extern/libmv/libmv/autotrack/frame_accessor.h
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@@ -1,86 +0,0 @@
-// Copyright (c) 2014 libmv authors.
-//
-// Permission is hereby granted, free of charge, to any person obtaining a copy
-// of this software and associated documentation files (the "Software"), to
-// deal in the Software without restriction, including without limitation the
-// rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
-// sell copies of the Software, and to permit persons to whom the Software is
-// furnished to do so, subject to the following conditions:
-//
-// The above copyright notice and this permission notice shall be included in
-// all copies or substantial portions of the Software.
-//
-// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
-// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
-// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
-// IN THE SOFTWARE.
-//
-// Author: mierle@gmail.com (Keir Mierle)
-
-#ifndef LIBMV_AUTOTRACK_FRAME_ACCESSOR_H_
-#define LIBMV_AUTOTRACK_FRAME_ACCESSOR_H_
-
-#include <stdint.h>
-
-#include "libmv/image/image.h"
-
-namespace mv {
-
-struct Region;
-
-using libmv::FloatImage;
-
-// This is the abstraction to different sources of images that will be part of
-// a reconstruction. These may come from disk or they may come from Blender. In
-// most cases it's expected that the implementation provides some caching
-// otherwise performance will be terrible. Sometimes the images need to get
-// filtered, and this interface provides for that as well (and permits
-// implementations to cache filtered image pieces).
-struct FrameAccessor {
-  struct Transform {
-    virtual ~Transform() {  }
-    // The key should depend on the transform arguments. Must be non-zero.
-    virtual int64_t key() const = 0;
-
-    // Apply the expected transform. Output is sized correctly already.
-    // TODO(keir): What about blurs that need to access pixels outside the ROI?
-    virtual void run(const FloatImage& input, FloatImage* output) const = 0;
-  };
-
-  enum InputMode {
-    MONO,
-    RGBA
-  };
-
-  typedef void* Key;
-
-  // Get a possibly-filtered version of a frame of a video. Downscale will
-  // cause the input image to get downscaled by 2^downscale for pyramid access.
-  // Region is always in original-image coordinates, and describes the
-  // requested area. The transform describes an (optional) transform to apply
-  // to the image before it is returned.
-  //
-  // When done with an image, you must call ReleaseImage with the returned key.
-  virtual Key GetImage(int clip,
-                       int frame,
-                       InputMode input_mode,
-                       int downscale,               // Downscale by 2^downscale.
-                       const Region* region,        // Get full image if NULL.
-                       const Transform* transform,  // May be NULL.
-                       FloatImage* destination) = 0;
-
-  // Releases an image from the frame accessor. Non-caching implementations may
-  // free the image immediately; others may hold onto the image.
-  virtual void ReleaseImage(Key) = 0;
-
-  virtual bool GetClipDimensions(int clip, int* width, int* height) = 0;
-  virtual int NumClips() = 0;
-  virtual int NumFrames(int clip) = 0;
-};
-
-}  // namespace libmv
-
-#endif  // LIBMV_AUTOTRACK_FRAME_ACCESSOR_H_