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diff --git a/extern/ceres/internal/ceres/scratch_evaluate_preparer.cc b/extern/ceres/internal/ceres/scratch_evaluate_preparer.cc
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+// Ceres Solver - A fast non-linear least squares minimizer
+// Copyright 2015 Google Inc. All rights reserved.
+// http://ceres-solver.org/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are met:
+//
+// * Redistributions of source code must retain the above copyright notice,
+//   this list of conditions and the following disclaimer.
+// * Redistributions in binary form must reproduce the above copyright notice,
+//   this list of conditions and the following disclaimer in the documentation
+//   and/or other materials provided with the distribution.
+// * Neither the name of Google Inc. nor the names of its contributors may be
+//   used to endorse or promote products derived from this software without
+//   specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+// POSSIBILITY OF SUCH DAMAGE.
+//
+// Author: keir@google.com (Keir Mierle)
+
+#include "ceres/scratch_evaluate_preparer.h"
+
+#include "ceres/parameter_block.h"
+#include "ceres/program.h"
+#include "ceres/residual_block.h"
+
+namespace ceres {
+namespace internal {
+
+ScratchEvaluatePreparer* ScratchEvaluatePreparer::Create(
+    const Program &program,
+    int num_threads) {
+  ScratchEvaluatePreparer* preparers = new ScratchEvaluatePreparer[num_threads];
+  int max_derivatives_per_residual_block =
+      program.MaxDerivativesPerResidualBlock();
+  for (int i = 0; i < num_threads; i++) {
+    preparers[i].Init(max_derivatives_per_residual_block);
+  }
+  return preparers;
+}
+
+void ScratchEvaluatePreparer::Init(int max_derivatives_per_residual_block) {
+  jacobian_scratch_.reset(
+      new double[max_derivatives_per_residual_block]);
+}
+
+// Point the jacobian blocks into the scratch area of this evaluate preparer.
+void ScratchEvaluatePreparer::Prepare(const ResidualBlock* residual_block,
+                                      int /* residual_block_index */,
+                                      SparseMatrix* /* jacobian */,
+                                      double** jacobians) {
+  double* jacobian_block_cursor = jacobian_scratch_.get();
+  int num_residuals = residual_block->NumResiduals();
+  int num_parameter_blocks = residual_block->NumParameterBlocks();
+  for (int j = 0; j < num_parameter_blocks; ++j) {
+    const ParameterBlock* parameter_block =
+        residual_block->parameter_blocks()[j];
+    if (parameter_block->IsConstant()) {
+      jacobians[j] = NULL;
+    } else {
+      jacobians[j] = jacobian_block_cursor;
+      jacobian_block_cursor += num_residuals * parameter_block->LocalSize();
+    }
+  }
+}
+
+}  // namespace internal
+}  // namespace ceres