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diff --git a/externals/ace/Message_Queue_NT.h b/externals/ace/Message_Queue_NT.h
deleted file mode 100644
index e959e57cf2b..00000000000
--- a/externals/ace/Message_Queue_NT.h
+++ /dev/null
@@ -1,231 +0,0 @@
-// -*- C++ -*-
-
-//=============================================================================
-/**
- *  @file    Message_Queue_NT.h
- *
- *  $Id: Message_Queue_NT.h 82723 2008-09-16 09:35:44Z johnnyw $
- *
- *  @author Douglas C. Schmidt <schmidt@cs.wustl.edu>
- */
-//=============================================================================
-
-#ifndef ACE_MESSAGE_QUEUE_NT_H
-#define ACE_MESSAGE_QUEUE_NT_H
-#include /**/ "ace/pre.h"
-
-#include "ace/Message_Queue.h"
-
-#if !defined (ACE_LACKS_PRAGMA_ONCE)
-# pragma once
-#endif /* ACE_LACKS_PRAGMA_ONCE */
-
-#if defined (ACE_HAS_WIN32_OVERLAPPED_IO)
-# include "ace/Synch_Traits.h"   /* Needed in ACE_Message_Queue_NT */
-# include "ace/Thread_Mutex.h"   /* Needed in ACE_Message_Queue_NT */
-#endif
-
-ACE_BEGIN_VERSIONED_NAMESPACE_DECL
-
-#if defined (ACE_HAS_WIN32_OVERLAPPED_IO)
-/**
- * @class ACE_Message_Queue_NT
- *
- * @brief Message Queue implementation using IO completion port on NT.
- *
- * Implementation of a strip-downed ACE_Message_Queue using NT's
- * IO completion port mechanism.
- * @note *Many* ACE_Message_Queue features are not supported with
- * this implementation, including:
- * * <open> method have different signatures.
- * * <dequeue_head> *requires* that the ACE_Message_Block
- * pointer argument point to an ACE_Message_Block that was
- * allocated by the caller.
- * * <peek_dequeue_head>.
- * * <ACE_Message_Queue_Iterators>.
- * * No flow control.
- */
-class ACE_Export ACE_Message_Queue_NT : public ACE_Message_Queue_Base
-{
-public:
-  // = Initialization and termination methods.
-  ACE_Message_Queue_NT (DWORD max_threads = ACE_Message_Queue_Base::DEFAULT_HWM);
-
-  /**
-   * Initialize the Message Queue by creating a new NT I/O completion
-   * port.  The first arguemnt specifies the number of threads
-   * released by the MQ that are allowed to run concurrently.  Return
-   * 0 when succeeds, -1 otherwise.
-   */
-  virtual int open (DWORD max_threads = ACE_Message_Queue_Base::DEFAULT_HWM);
-
-  /// Close down the underlying I/O completion port.  You need to
-  /// re-open the MQ after this function is executed.
-  virtual int close (void);
-
-  /// Close down the message queue and release all resources.
-  virtual ~ACE_Message_Queue_NT (void);
-
-  // = Enqueue and dequeue methods.
-
-  /**
-   * Enqueue an ACE_Message_Block * at the end of the queue.
-   * Returns -1 on failure, else the number of items still on the
-   * queue.
-   */
-  virtual int enqueue_tail (ACE_Message_Block *new_item,
-                            ACE_Time_Value *timeout = 0);
-  virtual int enqueue (ACE_Message_Block *new_item,
-                       ACE_Time_Value *timeout = 0);
-
-  /**
-   * Dequeue and return the ACE_Message_Block * at the head of the
-   * queue.  Returns -1 on failure, else the number of items still on
-   * the queue.
-   */
-  virtual int dequeue_head (ACE_Message_Block *&first_item,
-                            ACE_Time_Value *timeout = 0);
-  virtual int dequeue (ACE_Message_Block *&first_item,
-                       ACE_Time_Value *timeout = 0);
-
-  // = Check if queue is full/empty.
-  /**
-   * Always return false.
-   */
-
-  virtual bool is_full (void);
-  /**
-   * True if queue is empty, else false.  Notice the return value is
-   * only transient.
-   */
-  virtual bool is_empty (void);
-
-  // = Queue statistic methods (transient.)
-  /**
-   * Number of total bytes on the queue, i.e., sum of the message
-   * block sizes.
-   */
-  virtual size_t message_bytes (void);
-
-  /**
-   * Number of total length on the queue, i.e., sum of the message
-   * block lengths.
-   */
-  virtual size_t message_length (void);
-
-  /**
-   * Number of total messages on the queue.
-   */
-  virtual size_t message_count (void);
-
-  // = Manual changes to these stats (used when queued message blocks
-  // change size or lengths).
-  /**
-   * New value of the number of total bytes on the queue, i.e., sum of
-   * the message block sizes.
-   */
-  virtual void message_bytes (size_t new_size);
-
-  /**
-   * New value of the number of total length on the queue, i.e., sum
-   * of the message block lengths.
-   */
-  virtual void message_length (size_t new_length);
-
-  /// Get the max concurrent thread number.
-  virtual DWORD max_threads (void);
-
-  // = Activation control methods.
-
-  /**
-   * Deactivate the queue and wake up all threads waiting on the queue
-   * so they can continue.  No messages are removed from the queue,
-   * however.  Any other operations called until the queue is
-   * activated again will immediately return -1 with @c errno
-   * ESHUTDOWN.
-   *
-   * @retval  The queue's state before this call.
-   */
-  virtual int deactivate (void);
-
-  /**
-   * Reactivate the queue so that threads can enqueue and dequeue
-   * messages again.  Returns the state of the queue before the call.
-   */
-  virtual int activate (void);
-
-  /**
-   * Pulse the queue to wake up any waiting threads.  Changes the
-   * queue state to PULSED; future enqueue/dequeue operations proceed
-   * as in ACTIVATED state.
-   *
-   * @retval  The queue's state before this call.
-   */
-  virtual int pulse (void);
-
-  /// Returns true if the state of the queue is <DEACTIVATED>,
-  /// but false if the queue's is <ACTIVATED> or <PULSED>.
-  virtual int deactivated (void);
-
-  // = Not currently implemented...
-  int peek_dequeue_head (ACE_Message_Block *&first_item,
-                         ACE_Time_Value *timeout = 0);
-  ACE_Notification_Strategy *notification_strategy (void);
-  void notification_strategy (ACE_Notification_Strategy *s);
-
-  // = Notification hook.
-
-  /// Dump the state of an object.
-  virtual void dump (void) const;
-
-  /// Get the handle to the underlying completion port.
-  virtual ACE_HANDLE completion_port (void);
-
-  /// Declare the dynamic allocation hooks.
-  ACE_ALLOC_HOOK_DECLARE;
-
-private:
-
-  // Disallow copying and assignment.
-  ACE_Message_Queue_NT (const ACE_Message_Queue_NT &);
-  void operator= (const ACE_Message_Queue_NT &);
-
-private:
-  // = Internal states.
-
-  /// Maximum threads that can be released (and run) concurrently.
-  DWORD max_cthrs_;
-
-  /// Current number of threads waiting to dequeue messages.
-  DWORD cur_thrs_;
-
-  /// Current number of bytes in queue.
-  size_t cur_bytes_;
-
-  /// Current length of messages in queue.
-  size_t cur_length_;
-
-  /// Current number of messages in the queue.
-  size_t cur_count_;
-
-  /**
-   * Synchronizer.  This should really be an ACE_Recursive_Thread_Mutex
-   * but since this class is only supported on NT, it's okay to use
-   * ACE_Thread_Mutex here.
-   */
-  ACE_SYNCH_MUTEX lock_;
-
-  /// Underlying NT IoCompletionPort.
-  ACE_HANDLE completion_port_;
-
-};
-#endif /* ACE_HAS_WIN32_OVERLAPPED_IO */
-
-ACE_END_VERSIONED_NAMESPACE_DECL
-
-#if defined (__ACE_INLINE__)
-#include "ace/Message_Queue_NT.inl"
-#endif /* __ACE_INLINE__ */
-
-#include /**/ "ace/post.h"
-#endif /* ACE_MESSAGE_QUEUE_NT_H */