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diff --git a/intl/icu/source/tools/tzcode/tz2icu.h b/intl/icu/source/tools/tzcode/tz2icu.h
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+// © 2016 and later: Unicode, Inc. and others.
+// License & terms of use: http://www.unicode.org/copyright.html
+/*
+**********************************************************************
+* Copyright (c) 2003-2013, International Business Machines
+* Corporation and others.  All Rights Reserved.
+**********************************************************************
+* Author: Alan Liu
+* Created: July 10 2003
+* Since: ICU 2.8
+**********************************************************************
+*/
+
+#ifndef _TZ2ICU_H_
+#define _TZ2ICU_H_
+
+/* We have modified the zoneinfo binary format (we write raw offset
+ * and DST offset separately instead of their sum) so we notate the
+ * file with a distinct signature.  This prevents someone from trying
+ * to use our output files as normal zoneinfo files, and also prevents
+ * someone from trying to use normal zoneinfo files for ICU.  We also
+ * use the first byte of the reserved section as a version integer, to
+ * be incremented each time the data format changes.
+ */
+
+#define TZ_ICU_MAGIC "TZic" /* cf. TZ_MAGIC = "TZif" */
+
+typedef unsigned char ICUZoneinfoVersion;
+
+#define TZ_ICU_VERSION ((ICUZoneinfoVersion) 1)
+
+/* File into which we will write supplemental ICU data.  This allows
+ * zic to communicate final zone data to tz2icu. */
+#define ICU_ZONE_FILE "icu_zone.txt"
+
+/* Output resource name.  This determines both the file name and the
+ * resource name within the file.  That is, the output will be to the
+ * file ICU_TZ_RESOURCE ".txt" and the resource within it will be
+ * ICU_TZ_RESOURCE. */
+#define ICU_TZ_RESOURCE_OLD "zoneinfo"
+#define ICU_TZ_RESOURCE "zoneinfo64"
+
+/* File containing custom zone-region mapping. */
+#define ICU_REGIONS "icuregions"
+
+#endif