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diff --git a/libcilkrts/runtime/cilk_fiber-unix.h b/libcilkrts/runtime/cilk_fiber-unix.h
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+/* cilk_fiber-unix.h                  -*-C++-*-
+ *
+ *************************************************************************
+ *
+ *  @copyright
+ *  Copyright (C) 2012-2013, Intel Corporation
+ *  All rights reserved.
+ *  
+ *  @copyright
+ *  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 Intel Corporation nor the names of its
+ *      contributors may be used to endorse or promote products derived
+ *      from this software without specific prior written permission.
+ *  
+ *  @copyright
+ *  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
+ *  HOLDER 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.
+ **************************************************************************/
+
+#ifndef INCLUDED_CILK_FIBER_UNIX_DOT_H
+#define INCLUDED_CILK_FIBER_UNIX_DOT_H
+
+#ifndef __cplusplus
+#   error cilk_fiber-unix.h is a C++-only header
+#endif
+
+#include "cilk_fiber.h"
+#include "jmpbuf.h"
+
+/**
+ * @file cilk_fiber-unix.h
+ *
+ * @brief Unix-specific implementation for cilk_fiber.
+ */
+
+/**
+ * @brief Unix-specific fiber class derived from portable fiber class
+ */
+struct cilk_fiber_sysdep : public cilk_fiber
+{
+  public:
+
+#if SUPPORT_GET_CURRENT_FIBER
+    /**
+     * @brief Gets the current fiber from TLS.
+     */
+    static cilk_fiber_sysdep* get_current_fiber_sysdep();
+#endif
+
+    /**
+     * @brief Construct the system-dependent portion of a fiber.
+     *
+     * @param stack_size  The size of the stack for this fiber.
+     */ 
+    cilk_fiber_sysdep(std::size_t stack_size);
+
+    /**
+     * @brief Construct the system-dependent of a fiber created from a
+     * thread.
+     */ 
+    cilk_fiber_sysdep(from_thread_t);
+
+    /**
+     * @brief Destructor
+     */ 
+    ~cilk_fiber_sysdep();
+
+    /**
+     * @brief OS-specific calls to convert this fiber back to thread.
+     *
+     * Nothing to do for Linux.
+     */
+    void convert_fiber_back_to_thread();
+
+    /**
+     * @brief System-dependent function to suspend self and resume execution of "other".
+     *
+     * This fiber is suspended.
+     *          
+     * @pre @c is_resumable() should be true. 
+     *
+     * @param other              Fiber to resume.
+     */
+    void suspend_self_and_resume_other_sysdep(cilk_fiber_sysdep* other);
+
+    /**
+     * @brief System-dependent function called to jump to @p other
+     * fiber.
+     *
+     * @pre @c is_resumable() should be false.
+     *
+     * @param other  Fiber to resume.
+     */
+    NORETURN jump_to_resume_other_sysdep(cilk_fiber_sysdep* other);
+    
+    /**
+     * @brief Runs the start_proc.
+     * @pre is_resumable() should be false.
+     * @pre is_allocated_from_thread() should be false.
+     * @pre m_start_proc must be valid.
+     */
+    NORETURN run();
+
+    /**
+     * @brief Returns the base of this fiber's stack.
+     */
+    inline char* get_stack_base_sysdep() { return m_stack_base; }
+
+  private:
+    char*                       m_stack_base;     ///< The base of this fiber's stack.
+    char*                       m_stack;          // Stack memory (low address)
+    __CILK_JUMP_BUFFER          m_resume_jmpbuf;  // Place to resume fiber
+    unsigned                    m_magic;          // Magic number for checking
+
+    static int                  s_page_size;      // Page size for
+                                                  // stacks.
+
+    // Allocate memory for a stack.  This method
+    // initializes m_stack and m_stack_base.
+    void make_stack(size_t stack_size);
+
+    // Deallocates memory for the stack.
+    void free_stack();
+
+    // Common helper method for implementation of resume_other_sysdep
+    // variants.
+    inline void resume_other_sysdep(cilk_fiber_sysdep* other);
+};
+
+#endif // ! defined(INCLUDED_CILK_FIBER_UNIX_DOT_H)