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diff --git a/thirdparty/icu4c/common/icuplugimp.h b/thirdparty/icu4c/common/icuplugimp.h
new file mode 100644
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+++ b/thirdparty/icu4c/common/icuplugimp.h
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+// © 2016 and later: Unicode, Inc. and others.
+// License & terms of use: http://www.unicode.org/copyright.html
+/*
+******************************************************************************
+*
+*   Copyright (C) 2009-2015, International Business Machines
+*   Corporation and others.  All Rights Reserved.
+*
+******************************************************************************
+*
+*  FILE NAME : icuplugimp.h
+* 
+*  Internal functions for the ICU plugin system
+*
+*   Date         Name        Description
+*   10/29/2009   sl          New.
+******************************************************************************
+*/
+
+
+#ifndef ICUPLUGIMP_H
+#define ICUPLUGIMP_H
+
+#include "unicode/icuplug.h"
+
+#if UCONFIG_ENABLE_PLUGINS
+
+/*========================*/
+/** @{ Library Manipulation  
+ */
+
+/**
+ * Open a library, adding a reference count if needed.
+ * @param libName library name to load
+ * @param status error code
+ * @return the library pointer, or NULL
+ * @internal internal use only
+ */
+U_CAPI void * U_EXPORT2
+uplug_openLibrary(const char *libName, UErrorCode *status);
+
+/**
+ * Close a library, if its reference count is 0
+ * @param lib the library to close
+ * @param status error code
+ * @internal internal use only
+ */
+U_CAPI void U_EXPORT2
+uplug_closeLibrary(void *lib, UErrorCode *status);
+
+/**
+ * Get a library's name, or NULL if not found.
+ * @param lib the library's name
+ * @param status error code
+ * @return the library name, or NULL if not found.
+ * @internal internal use only
+ */
+U_CAPI  char * U_EXPORT2
+uplug_findLibrary(void *lib, UErrorCode *status);
+
+/** @} */
+
+/*========================*/
+/** {@ ICU Plugin internal interfaces
+ */
+
+/**
+ * Initialize the plugins 
+ * @param status error result
+ * @internal - Internal use only.
+ */
+U_CAPI void U_EXPORT2
+uplug_init(UErrorCode *status);
+
+/**
+ * Get raw plug N
+ * @internal - Internal use only
+ */ 
+U_CAPI UPlugData* U_EXPORT2
+uplug_getPlugInternal(int32_t n);
+
+/**
+ * Get the name of the plugin file. 
+ * @internal - Internal use only.
+ */
+U_CAPI const char* U_EXPORT2
+uplug_getPluginFile(void);
+
+/** @} */
+
+#endif
+
+#endif