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diff --git a/intl/icu/source/tools/gennorm2/n2builder.h b/intl/icu/source/tools/gennorm2/n2builder.h
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+++ b/intl/icu/source/tools/gennorm2/n2builder.h
@@ -0,0 +1,122 @@
+// © 2016 and later: Unicode, Inc. and others.
+// License & terms of use: http://www.unicode.org/copyright.html
+/*
+*******************************************************************************
+*
+*   Copyright (C) 2009-2014, International Business Machines
+*   Corporation and others.  All Rights Reserved.
+*
+*******************************************************************************
+*   file name:  n2builder.h
+*   encoding:   UTF-8
+*   tab size:   8 (not used)
+*   indentation:4
+*
+*   created on: 2009nov25
+*   created by: Markus W. Scherer
+*/
+
+#ifndef __N2BUILDER_H__
+#define __N2BUILDER_H__
+
+#include "unicode/utypes.h"
+
+#if !UCONFIG_NO_NORMALIZATION
+
+#include "unicode/errorcode.h"
+#include "unicode/umutablecptrie.h"
+#include "unicode/unistr.h"
+#include "normalizer2impl.h"  // for IX_COUNT
+#include "toolutil.h"
+#include "norms.h"
+
+U_NAMESPACE_BEGIN
+
+extern UBool beVerbose, haveCopyright;
+
+class Normalizer2DataBuilder {
+public:
+    Normalizer2DataBuilder(UErrorCode &errorCode);
+    ~Normalizer2DataBuilder();
+
+    enum OverrideHandling {
+        OVERRIDE_NONE,
+        OVERRIDE_ANY,
+        OVERRIDE_PREVIOUS
+    };
+
+    void setOverrideHandling(OverrideHandling oh);
+
+    enum Optimization {
+        OPTIMIZE_NORMAL,
+        OPTIMIZE_FAST
+    };
+
+    void setOptimization(Optimization opt) { optimization=opt; }
+
+    void setCC(UChar32 c, uint8_t cc);
+    void setOneWayMapping(UChar32 c, const UnicodeString &m);
+    void setRoundTripMapping(UChar32 c, const UnicodeString &m);
+    void removeMapping(UChar32 c);
+
+    void setUnicodeVersion(const char *v);
+
+    void writeBinaryFile(const char *filename);
+    void writeCSourceFile(const char *filename);
+    void writeDataFile(const char *filename, bool writeRemoved) const;
+
+    static void computeDiff(const Normalizer2DataBuilder &b1,
+                            const Normalizer2DataBuilder &b2,
+                            Normalizer2DataBuilder &diff);
+
+private:
+    friend class Norm16Writer;
+
+    Normalizer2DataBuilder(const Normalizer2DataBuilder &other) = delete;
+    Normalizer2DataBuilder &operator=(const Normalizer2DataBuilder &other) = delete;
+
+    Norm *checkNormForMapping(Norm *p, UChar32 c);  // check for permitted overrides
+
+    /**
+     * A starter character with a mapping does not have a composition boundary after it
+     * if the character itself combines-forward (which is tested by the caller of this function),
+     * or it is deleted (mapped to the empty string),
+     * or its mapping contains no starter,
+     * or the last starter combines-forward.
+     */
+    UBool mappingHasCompBoundaryAfter(const BuilderReorderingBuffer &buffer,
+                                      Norm::MappingType mappingType) const;
+    /** Returns true if the mapping by itself recomposes, that is, it is not comp-normalized. */
+    UBool mappingRecomposes(const BuilderReorderingBuffer &buffer) const;
+    void postProcess(Norm &norm);
+
+    void setSmallFCD(UChar32 c);
+    int32_t getMinNoNoDelta() const {
+        return indexes[Normalizer2Impl::IX_MIN_MAYBE_YES]-
+            ((2*Normalizer2Impl::MAX_DELTA+1)<<Normalizer2Impl::DELTA_SHIFT);
+    }
+    void writeNorm16(UMutableCPTrie *norm16Trie, UChar32 start, UChar32 end, Norm &norm);
+    void setHangulData(UMutableCPTrie *norm16Trie);
+    LocalUCPTriePointer processData();
+
+    Norms norms;
+
+    int32_t phase;
+    OverrideHandling overrideHandling;
+
+    Optimization optimization;
+
+    int32_t indexes[Normalizer2Impl::IX_COUNT];
+    uint8_t *norm16TrieBytes;
+    int32_t norm16TrieLength;
+    UnicodeString extraData;
+    uint8_t smallFCD[0x100];
+
+    UVersionInfo unicodeVersion;
+};
+
+U_NAMESPACE_END
+
+#endif // #if !UCONFIG_NO_NORMALIZATION
+
+#endif  // __N2BUILDER_H__