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diff --git a/thirdparty/linux/include/coin/IpLineSearch.hpp b/thirdparty/linux/include/coin/IpLineSearch.hpp
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+// Copyright (C) 2004, 2006 International Business Machines and others.
+// All Rights Reserved.
+// This code is published under the Eclipse Public License.
+//
+// $Id: IpLineSearch.hpp 1861 2010-12-21 21:34:47Z andreasw $
+//
+// Authors:  Carl Laird, Andreas Waechter     IBM    2004-08-13
+
+#ifndef __IPLINESEARCH_HPP__
+#define __IPLINESEARCH_HPP__
+
+#include "IpAlgStrategy.hpp"
+#include "IpIpoptCalculatedQuantities.hpp"
+
+namespace Ipopt
+{
+
+  /** Base class for line search objects.
+   */
+  class LineSearch : public AlgorithmStrategyObject
+  {
+  public:
+    /**@name Constructors/Destructors */
+    //@{
+    /** Default Constructor */
+    LineSearch()
+    {}
+
+    /** Default destructor */
+    virtual ~LineSearch()
+    {}
+    //@}
+
+    /** Perform the line search.  As search direction the delta
+     *  in the data object is used
+     */
+    virtual void FindAcceptableTrialPoint() = 0;
+
+    /** Reset the line search.
+     *  This function should be called if all previous information
+     *  should be discarded when the line search is performed the
+     *  next time.  For example, this method should be called after
+     *  the barrier parameter is changed.
+     */
+    virtual void Reset() = 0;
+
+    /** Set flag indicating whether a very rigorous line search should
+     *  be performed.  If this flag is set to true, the line search
+     *  algorithm might decide to abort the line search and not to
+     *  accept a new iterate.  If the line search decided not to
+     *  accept a new iterate, the return value of
+     *  CheckSkippedLineSearch() is true at the next call.  For
+     *  example, in the non-monotone barrier parameter update
+     *  procedure, the filter algorithm should not switch to the
+     *  restoration phase in the free mode; instead, the algorithm
+     *  should swtich to the fixed mode.
+     */
+    virtual void SetRigorousLineSearch(bool rigorous) = 0;
+
+    /** Check if the line search procedure didn't accept a new iterate
+     *  during the last call of FindAcceptableTrialPoint().
+     *  
+     */
+    virtual bool CheckSkippedLineSearch() = 0;
+
+    /** This method should be called if the optimization process
+     *  requires the line search object to switch to some fallback
+     *  mechanism (like the restoration phase), when the regular
+     *  optimization procedure cannot be continued (for example,
+     *  because the search direction could not be computed).  This
+     *  will cause the line search object to immediately proceed with
+     *  this mechanism when FindAcceptableTrialPoint() is call.  This
+     *  method returns false if no fallback mechanism is available. */
+    virtual bool ActivateFallbackMechanism() = 0;
+
+  private:
+    /**@name Default Compiler Generated Methods
+     * (Hidden to avoid implicit creation/calling).
+     * These methods are not implemented and 
+     * we do not want the compiler to implement
+     * them for us, so we declare them private
+     * and do not define them. This ensures that
+     * they will not be implicitly created/called. */
+    //@{
+    /** Copy Constructor */
+    LineSearch(const LineSearch&);
+
+    /** Overloaded Equals Operator */
+    void operator=(const LineSearch&);
+    //@}
+
+  };
+
+} // namespace Ipopt
+
+#endif