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diff --git a/intl/icu/source/common/uassert.h b/intl/icu/source/common/uassert.h
new file mode 100644
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+++ b/intl/icu/source/common/uassert.h
@@ -0,0 +1,71 @@
+// © 2016 and later: Unicode, Inc. and others.
+// License & terms of use: http://www.unicode.org/copyright.html
+/*
+******************************************************************************
+*
+*   Copyright (C) 2002-2011, International Business Machines
+*   Corporation and others.  All Rights Reserved.
+*
+******************************************************************************
+*
+* File uassert.h
+*
+*  Contains the U_ASSERT and UPRV_UNREACHABLE_* macros
+*
+******************************************************************************
+*/
+#ifndef U_ASSERT_H
+#define U_ASSERT_H
+
+/* utypes.h is included to get the proper define for uint8_t */
+#include "unicode/utypes.h"
+/* for abort */
+#include <stdlib.h>
+
+/**
+ * \def U_ASSERT
+ * By default, U_ASSERT just wraps the C library assert macro.
+ * By changing the definition here, the assert behavior for ICU can be changed
+ * without affecting other non - ICU uses of the C library assert().
+*/
+#if U_DEBUG
+#   include <assert.h>
+#   define U_ASSERT(exp) assert(exp)
+#elif U_CPLUSPLUS_VERSION
+#   define U_ASSERT(exp) (void)0
+#else
+#   define U_ASSERT(exp)
+#endif
+
+/**
+ * \def UPRV_UNREACHABLE_ASSERT
+ * This macro is used in places that we had believed were unreachable, but
+ * experience has shown otherwise (possibly due to memory corruption, etc).
+ * In this case we call assert() in debug versions as with U_ASSERT, instead
+ * of unconditionally calling abort(). However we also allow redefinition as
+ * with UPRV_UNREACHABLE_EXIT.
+ * @internal
+*/
+#if defined(UPRV_UNREACHABLE_ASSERT)
+    // Use the predefined value.
+#elif U_DEBUG
+#   include <assert.h>
+#   define UPRV_UNREACHABLE_ASSERT assert(false)
+#elif U_CPLUSPLUS_VERSION
+#   define UPRV_UNREACHABLE_ASSERT (void)0
+#else
+#   define UPRV_UNREACHABLE_ASSERT
+#endif
+
+/**
+ * \def UPRV_UNREACHABLE_EXIT
+ * This macro is used to unconditionally abort if unreachable code is ever executed.
+ * @internal
+*/
+#if defined(UPRV_UNREACHABLE_EXIT)
+    // Use the predefined value.
+#else
+#   define UPRV_UNREACHABLE_EXIT abort()
+#endif
+
+#endif