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diff --git a/src/systemc/dt/int/sc_nbdefs.hh b/src/systemc/dt/int/sc_nbdefs.hh
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+/*****************************************************************************
+
+  Licensed to Accellera Systems Initiative Inc. (Accellera) under one or
+  more contributor license agreements.  See the NOTICE file distributed
+  with this work for additional information regarding copyright ownership.
+  Accellera licenses this file to you under the Apache License, Version 2.0
+  (the "License"); you may not use this file except in compliance with the
+  License.  You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+  Unless required by applicable law or agreed to in writing, software
+  distributed under the License is distributed on an "AS IS" BASIS,
+  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
+  implied.  See the License for the specific language governing
+  permissions and limitations under the License.
+
+ *****************************************************************************/
+
+/*****************************************************************************
+  sc_nbdefs.h -- Top level header file for arbitrary precision signed/unsigned
+                 arithmetic. This file defines all the constants needed.
+ *****************************************************************************/
+
+#ifndef __SYSTEMC_DT_SC_NBDEFS_H__
+#define __SYSTEMC_DT_SC_NBDEFS_H__
+
+#include <stdint.h>
+
+#include <climits>
+
+namespace sc_dt
+{
+
+// ----------------------------------------------------------------------------
+//  ENUM : sc_numrep
+//
+//  Enumeration of number representations for character string conversion.
+// ----------------------------------------------------------------------------
+
+enum sc_numrep
+{
+    SC_NOBASE = 0,
+    SC_BIN = 2,
+    SC_OCT = 8,
+    SC_DEC = 10,
+    SC_HEX = 16,
+    SC_BIN_US,
+    SC_BIN_SM,
+    SC_OCT_US,
+    SC_OCT_SM,
+    SC_HEX_US,
+    SC_HEX_SM,
+    SC_CSD
+};
+
+
+// Sign of a number:
+#define SC_NEG -1 // Negative number
+#define SC_ZERO 0 // Zero
+#define SC_POS 1 // Positive number
+#define SC_NOSIGN 2 // Uninitialized sc_signed number
+
+typedef unsigned char uchar;
+
+// A small_type number is at least a char. Defining an int is probably
+// better for alignment.
+typedef int small_type;
+
+// Attributes of a byte.
+#define BITS_PER_BYTE 8
+#define BYTE_RADIX 256
+#define BYTE_MASK 255
+
+// LOG2_BITS_PER_BYTE = log2(BITS_PER_BYTE), assuming that
+// BITS_PER_BYTE is a power of 2.
+#define LOG2_BITS_PER_BYTE 3
+
+// Attributes of the unsigned long. These definitions are used mainly in
+// the functions that are aware of the internal representation of digits,
+// e.g., get/set_packed_rep().
+#define BYTES_PER_DIGIT_TYPE 4
+#define BITS_PER_DIGIT_TYPE 32
+
+// Attributes of a digit, i.e., unsigned long less the overflow bits.
+#define BYTES_PER_DIGIT 4
+#define BITS_PER_DIGIT 30
+#define DIGIT_RADIX (1ul << BITS_PER_DIGIT)
+#define DIGIT_MASK (DIGIT_RADIX - 1)
+// Make sure that BYTES_PER_DIGIT = ceil(BITS_PER_DIGIT / BITS_PER_BYTE).
+
+// Similar attributes for the half of a digit. Note that
+// HALF_DIGIT_RADIX is equal to the square root of DIGIT_RADIX. These
+// definitions are used mainly in the multiplication routines.
+#define BITS_PER_HALF_DIGIT (BITS_PER_DIGIT / 2)
+#define HALF_DIGIT_RADIX (1ul << BITS_PER_HALF_DIGIT)
+#define HALF_DIGIT_MASK (HALF_DIGIT_RADIX - 1)
+
+// DIV_CEIL2(x, y) = ceil(x / y). x and y are positive numbers.
+#define DIV_CEIL2(x, y) (((x) - 1) / (y) + 1)
+
+// DIV_CEIL(x) = ceil(x / BITS_PER_DIGIT) = the number of digits to
+// store x bits. x is a positive number.
+#define DIV_CEIL(x) DIV_CEIL2(x, BITS_PER_DIGIT)
+
+#ifdef SC_MAX_NBITS
+static const int MAX_NDIGITS = DIV_CEIL(SC_MAX_NBITS) + 2;
+// Consider a number with x bits another with y bits. The maximum
+// number of bits happens when we multiply them. The result will have
+// (x + y) bits. Assume that x + y <= SC_MAX_NBITS. Then, DIV_CEIL(x) +
+// DIV_CEIL(y) <= DIV_CEIL(SC_MAX_NBITS) + 2. This is the reason for +2
+// above. With this change, MAX_NDIGITS must be enough to hold the
+// result of any operation.
+#endif
+
+// Support for "digit" vectors used to hold the values of sc_signed,
+// sc_unsigned, sc_bv_base,  and sc_lv_base data types. This type is also used
+// in the concatenation support. An sc_digit is currently an unsigned 32-bit
+// quantity. The typedef used is an unsigned int, rather than an unsigned long,
+// since the unsigned long data type varies in size between 32-bit and 64-bit
+// machines.
+
+typedef unsigned int sc_digit;	// 32-bit unsigned integer
+
+// Support for the long long type. This type is not in the standard
+// but is usually supported by compilers.
+typedef int64_t int64;
+typedef uint64_t uint64;
+
+static const uint64 UINT64_ZERO   = 0ULL;
+static const uint64 UINT64_ONE    = 1ULL;
+static const uint64 UINT64_32ONES = 0x00000000ffffffffULL;
+
+// Bits per ...
+// will be deleted in the future. Use numeric_limits instead
+#define BITS_PER_CHAR    8
+#define BITS_PER_INT    (sizeof(int) * BITS_PER_CHAR)
+#define BITS_PER_LONG   (sizeof(long) * BITS_PER_CHAR)
+#define BITS_PER_INT64  (sizeof(::sc_dt::int64) * BITS_PER_CHAR)
+#define BITS_PER_UINT   (sizeof(unsigned int) * BITS_PER_CHAR)
+#define BITS_PER_ULONG  (sizeof(unsigned long) * BITS_PER_CHAR)
+#define BITS_PER_UINT64 (sizeof(::sc_dt::uint64) * BITS_PER_CHAR)
+
+// Digits per ...
+#define DIGITS_PER_CHAR   1
+#define DIGITS_PER_INT    ((BITS_PER_INT+29)/30)
+#define DIGITS_PER_LONG   ((BITS_PER_LONG+29)/30)
+#define DIGITS_PER_INT64  ((BITS_PER_INT64+29)/30)
+#define DIGITS_PER_UINT   ((BITS_PER_UINT+29)/30)
+#define DIGITS_PER_ULONG  ((BITS_PER_ULONG+29)/30)
+#define DIGITS_PER_UINT64 ((BITS_PER_UINT64+29)/30)
+
+// Above, BITS_PER_X is mainly used for sc_signed, and BITS_PER_UX is
+// mainly used for sc_unsigned.
+
+static const small_type NB_DEFAULT_BASE = SC_DEC;
+
+// For sc_int code:
+
+typedef int64 int_type;
+typedef uint64 uint_type;
+#define SC_INTWIDTH 64
+static const uint64 UINT_ZERO = UINT64_ZERO;
+static const uint64 UINT_ONE = UINT64_ONE;
+
+} // namespace sc_dt
+
+#endif