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diff --git a/extern/ceres/internal/ceres/linear_solver.cc b/extern/ceres/internal/ceres/linear_solver.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: sameeragarwal@google.com (Sameer Agarwal)
+
+#include "ceres/linear_solver.h"
+
+#include "ceres/cgnr_solver.h"
+#include "ceres/dense_normal_cholesky_solver.h"
+#include "ceres/dense_qr_solver.h"
+#include "ceres/iterative_schur_complement_solver.h"
+#include "ceres/schur_complement_solver.h"
+#include "ceres/sparse_normal_cholesky_solver.h"
+#include "ceres/types.h"
+#include "glog/logging.h"
+
+namespace ceres {
+namespace internal {
+
+LinearSolver::~LinearSolver() {
+}
+
+LinearSolverType LinearSolver::LinearSolverForZeroEBlocks(
+    LinearSolverType linear_solver_type) {
+  if (!IsSchurType(linear_solver_type)) {
+    return linear_solver_type;
+  }
+
+  if (linear_solver_type == SPARSE_SCHUR) {
+    return SPARSE_NORMAL_CHOLESKY;
+  }
+
+  if (linear_solver_type == DENSE_SCHUR) {
+    // TODO(sameeragarwal): This is probably not a great choice.
+    // Ideally, we should have a DENSE_NORMAL_CHOLESKY, that can take
+    // a BlockSparseMatrix as input.
+    return DENSE_QR;
+  }
+
+  if (linear_solver_type == ITERATIVE_SCHUR) {
+    return CGNR;
+  }
+
+  return linear_solver_type;
+}
+
+LinearSolver* LinearSolver::Create(const LinearSolver::Options& options) {
+  switch (options.type) {
+    case CGNR:
+      return new CgnrSolver(options);
+
+    case SPARSE_NORMAL_CHOLESKY:
+#if defined(CERES_NO_SUITESPARSE) &&              \
+    defined(CERES_NO_CXSPARSE) &&                 \
+   !defined(CERES_USE_EIGEN_SPARSE)
+      return NULL;
+#else
+      return new SparseNormalCholeskySolver(options);
+#endif
+
+    case SPARSE_SCHUR:
+#if defined(CERES_NO_SUITESPARSE) &&                 \
+    defined(CERES_NO_CXSPARSE) &&                    \
+   !defined(CERES_USE_EIGEN_SPARSE)
+      return NULL;
+#else
+      return new SparseSchurComplementSolver(options);
+#endif
+
+    case DENSE_SCHUR:
+      return new DenseSchurComplementSolver(options);
+
+    case ITERATIVE_SCHUR:
+      if (options.use_explicit_schur_complement) {
+        return new SparseSchurComplementSolver(options);
+      } else {
+        return new IterativeSchurComplementSolver(options);
+      }
+
+    case DENSE_QR:
+      return new DenseQRSolver(options);
+
+    case DENSE_NORMAL_CHOLESKY:
+      return new DenseNormalCholeskySolver(options);
+
+    default:
+      LOG(FATAL) << "Unknown linear solver type :"
+                 << options.type;
+      return NULL;  // MSVC doesn't understand that LOG(FATAL) never returns.
+  }
+}
+
+}  // namespace internal
+}  // namespace ceres