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diff --git a/externals/ace/RW_Process_Mutex.h b/externals/ace/RW_Process_Mutex.h
deleted file mode 100644
index 3953c2b4ddf..00000000000
--- a/externals/ace/RW_Process_Mutex.h
+++ /dev/null
@@ -1,137 +0,0 @@
-// -*- C++ -*-
-//
-//=============================================================================
-/**
- *  @file    RW_Process_Mutex.h
- *
- *  $Id: RW_Process_Mutex.h 87487 2009-11-12 07:54:39Z johnnyw $
- *
- *  @author Douglas C. Schmidt <schmidt@cs.wustl.edu>
- */
-//=============================================================================
-
-#ifndef ACE_RW_PROCESS_MUTEX_H
-#define ACE_RW_PROCESS_MUTEX_H
-
-#include /**/ "ace/pre.h"
-
-#include "ace/File_Lock.h"
-
-#if !defined (ACE_LACKS_PRAGMA_ONCE)
-# pragma once
-#endif /* ACE_LACKS_PRAGMA_ONCE */
-
-#include "ace/Default_Constants.h"
-
-ACE_BEGIN_VERSIONED_NAMESPACE_DECL
-
-/**
- * @class ACE_RW_Process_Mutex
- *
- * @brief Wrapper for readers/writer locks that exist across processes.
- *
- * @note This class uses an ACE_File_Lock as its implementation. Thus, it
- * can only be reliably used between separate processes, rather than
- * threads in the same process.  This isn't a limitation of ACE, it's simply
- * the file lock semantics on UNIX and Win32.
- *
- * @todo For systems with pthread_rwlockattr_setpshared one
- * may consider using them to make the mutex faster.
- */
-class ACE_Export ACE_RW_Process_Mutex
-{
-public:
-  /// Create a cross-process readers/writer mutex, passing in the optional
-  /// @a name, @a flags and @a mode \sa ACE_File_Lock.
-  /// If not specified, a name is generated and flags and mode are set
-  /// to default platform values.
-  ACE_RW_Process_Mutex (const ACE_TCHAR *name = 0,
-                        int flags = O_CREAT|O_RDWR,
-                        mode_t mode =  ACE_DEFAULT_RW_PROCESS_MUTEX_PERMS);
-
-  ~ACE_RW_Process_Mutex (void);
-
-  /**
-   * Explicitly destroy the mutex.  Note that only one thread should
-   * call this method since it doesn't protect against race
-   * conditions.
-   */
-  int remove (void);
-
-  /// Same as acquire_write().
-  /// Acquire lock ownership; blocks until the lock is acquired or the
-  /// operation fails.
-  int acquire (void);
-
-  /**
-   * Same as tryacquire_write().
-   * Try to acquire the lock, but do not block if the lock is not immediately
-   * acquired.
-   *
-   * @retval -1 on failure. If the lock is already held, @c errno is set
-   *         to @c EBUSY.
-   */
-  int tryacquire (void);
-
-  /// Release lock.
-  int release (void);
-
-  /// Acquire read lock; blocks until the lock is acquired or the
-  /// operation fails.
-  int acquire_read (void);
-
-  /// Acquire write lock; blocks until the lock is acquired or the
-  /// operation fails.
-  int acquire_write (void);
-
-  /**
-   * Try to acquire the read lock, but do not block if the lock is not
-   * immediately acquired.
-   *
-   * @retval -1 on failure. If the lock is already held, @c errno is set
-   *         to @c EBUSY.
-   */
-  int tryacquire_read (void);
-
-  /**
-   * Try to acquire the write lock, but do not block if the lock is not
-   * immediately acquired.
-   *
-   * @retval -1 on failure. If the lock is already held, @c errno is set
-   *         to @c EBUSY.
-   */
-  int tryacquire_write (void);
-
-  /// Attempt to upgrade a read lock to a write lock. Returns 0 on
-  /// success, -1 on failure.
-  int tryacquire_write_upgrade (void);
-
-  /// Return the underlying lock.
-  const ACE_File_Lock &lock (void) const;
-
-  /// Dump the state of an object.
-  void dump (void) const;
-
-  /// Declare the dynamic allocation hooks.
-  ACE_ALLOC_HOOK_DECLARE;
-
-private:
-  /// If the user does not provide a name we generate a unique name in
-  /// this buffer.
-  ACE_TCHAR name_[ACE_UNIQUE_NAME_LEN];
-
-  /// Create and return the unique name.
-  const ACE_TCHAR *unique_name (void);
-
-  /// We need this to get the readers/writer semantics...
-  ACE_File_Lock lock_;
-};
-
-ACE_END_VERSIONED_NAMESPACE_DECL
-
-#if defined (__ACE_INLINE__)
-#include "ace/RW_Process_Mutex.inl"
-#endif /* __ACE_INLINE__ */
-
-#include /**/ "ace/post.h"
-#endif /* ACE_RW_PROCESS_MUTEX_H */