unsigned long long undefined identifier.

I m integrating TCP/IP stack and compiling it with C166 Kiel compiler. The TCP/IP stack is from microchip.
I m getting the error

"GENERICTYPEDEFS.H(144): error C27: illegal type specifier"
line 144 contains
"typedef unsigned long long QWORD; "

This 64 bit dataype is being used frequently by TCP/IP stack.
How can we get this datatype in keil?

I found out that there is a file limits .h which defines the limits of the datatype

/*--------------------------------------------------------------------------
LIMITS.H

ANSI standard include file
for C166/EC++ Version 5.
Copyright (c) 1992-2004 Keil Elektronik GmbH and Keil Software, Inc.
All rights reserved.
--------------------------------------------------------------------------*/

#ifndef __LIMITS_H__
#define __LIMITS_H__

#define CHAR_BIT         8              /* Number of bits in any "char" */
#define CHAR_MAX         127            /* Max             "char" value */
#define CHAR_MIN        -128            /* Min             "char" value */
#define SCHAR_MAX        127            /* Max "signed"    "char" value */
#define SCHAR_MIN       -128            /* Min "signed"    "char" value */
#define UCHAR_MAX        255            /* Max "unsigned"  "char" value */
#define SHRT_MAX         32767          /* Max ("signed") "short" value */
#define SHRT_MIN       (-32767-1)       /* Min ("signed") "short" value */
#define USHRT_MAX        0xFFFF         /* Max "unsigned" "short" value */
#define INT_MAX          32767          /* Max ("signed")   "int" value */
#define INT_MIN        (-32767-1)       /* Min ("signed")   "int" value */
#define UINT_MAX         0xFFFF         /* Max "unsigned"   "int" value */
#define LONG_MAX         2147483647L    /* Max ("signed")  "long" value */
#define LONG_MIN       (-2147483647L-1) /* Min ("signed")  "long" value */
#define ULONG_MAX        0xFFFFFFFF     /* Max "unsigned"  "long" value */

#endif