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diff --git a/intl/icu/source/tools/toolutil/dbgutil.h b/intl/icu/source/tools/toolutil/dbgutil.h
new file mode 100644
index 0000000000..43fe2171b4
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+++ b/intl/icu/source/tools/toolutil/dbgutil.h
@@ -0,0 +1,45 @@
+// © 2016 and later: Unicode, Inc. and others.
+// License & terms of use: http://www.unicode.org/copyright.html
+
+/*
+************************************************************************
+* Copyright (c) 2007-2012, International Business Machines
+* Corporation and others.  All Rights Reserved.
+************************************************************************
+*/
+
+/** C++ Utilities to aid in debugging **/
+
+#ifndef _DBGUTIL_H
+#define _DBGUTIL_H
+
+#include "unicode/utypes.h"
+#include "udbgutil.h"
+#include "unicode/unistr.h"
+
+#if !UCONFIG_NO_FORMATTING
+
+U_TOOLUTIL_API const icu::UnicodeString& U_EXPORT2
+udbg_enumString(UDebugEnumType type, int32_t field);
+
+/**
+ * @return enum offset, or UDBG_INVALID_ENUM on error
+ */ 
+U_CAPI int32_t U_EXPORT2
+udbg_enumByString(UDebugEnumType type, const icu::UnicodeString& string);
+
+/**
+ * Convert a UnicodeString (with ascii digits) into a number.
+ * @param s string
+ * @return numerical value, or 0 on error
+ */
+U_CAPI int32_t U_EXPORT2 udbg_stoi(const icu::UnicodeString &s);
+
+U_CAPI double U_EXPORT2 udbg_stod(const icu::UnicodeString &s);
+
+U_CAPI icu::UnicodeString * U_EXPORT2
+udbg_escape(const icu::UnicodeString &s, icu::UnicodeString *dst);
+
+#endif
+
+#endif