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diff --git a/intern/eigen/intern/linear_solver.h b/intern/eigen/intern/linear_solver.h
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+++ b/intern/eigen/intern/linear_solver.h
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+/*
+ *  Sparse linear solver.
+ *  Copyright (C) 2004 Bruno Levy
+ *  Copyright (C) 2005-2015 Blender Foundation
+ *
+ *  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., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ *  If you modify this software, you should include a notice giving the
+ *  name of the person performing the modification, the date of modification,
+ *  and the reason for such modification.
+ */
+
+#pragma once
+
+#include <stdbool.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* Solvers for Ax = b and AtAx = Atb */
+
+typedef struct LinearSolver LinearSolver;
+
+LinearSolver *EIG_linear_solver_new(
+	int num_rows,
+	int num_columns,
+	int num_right_hand_sides);
+
+LinearSolver *EIG_linear_least_squares_solver_new(
+	int num_rows,
+	int num_columns,
+	int num_right_hand_sides);
+
+void EIG_linear_solver_delete(LinearSolver *solver);
+
+/* Variables (x). Any locking must be done before matrix construction. */
+
+void EIG_linear_solver_variable_set(LinearSolver *solver, int rhs, int index, double value);
+double EIG_linear_solver_variable_get(LinearSolver *solver, int rhs, int index);
+void EIG_linear_solver_variable_lock(LinearSolver *solver, int index);
+void EIG_linear_solver_variable_unlock(LinearSolver *solver, int index);
+
+/* Matrix (A) and right hand side (b) */
+
+void EIG_linear_solver_matrix_add(LinearSolver *solver, int row, int col, double value);
+void EIG_linear_solver_right_hand_side_add(LinearSolver *solver, int rhs, int index, double value);
+
+/* Solve. Repeated solves are supported, by changing b between solves. */
+
+bool EIG_linear_solver_solve(LinearSolver *solver);
+
+/* Debugging */
+
+void EIG_linear_solver_print_matrix(LinearSolver *solver);
+
+#ifdef __cplusplus
+}
+#endif
+