Error regarding QExplicitlySharedDataPointer

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Hi all,

I trying to build kdiff3-0.9.97 in my machine with the following config
Linux 2.6.18-274.el5 #1 SMP Fri Jul 8 17:36:59 EDT 2011 x86_64 x86_64 x86_64 GNU/Linux
Red Hat Enterprise Linux Server release 5.7 (Tikanga)

[root@xxxx releaseQt]# /usr/lib64/qt4/bin/qmake -v
QMake version 2.01a
Using Qt version 4.2.1 in /usr/lib64/qt4/lib64

I got the following error when I am trying to make.

[root@xxxxxx releaseQt]# make
g++ -c -include kdiff3 -m64 -pipe -O2 -D_REENTRANT -Wall -W -DQT_NO_DEBUG -DQT_GUI_LIB -DQT_CORE_LIB -DQT_SHARED -I/usr/lib64/qt4/mkspecs/linux-g++-64 -I../src-QT4 -/usr/lib64/qt4/include/QtCore -I/usr/lib64/qt4/include/QtCore -I/usr/lib64/qt4/include/QtGui -I/usr/lib64/qt4/include/QtGui -I/usr/lib64/qt4/include -I../src-QT4 -I../src-QT4/kreplacements -I../src-QT4 -I../src-QT4 -I. -o main.o ../src-QT4/main.cpp
In file included from ../src-QT4/kreplacements/kcmdlineargs.h:1,
from ../src-QT4/main.cpp:18:
../src-QT4/kreplacements/kreplacements.h:35:40: error: QExplicitlySharedDataPointer: No
../src-QT4/kreplacements/kreplacements.h:288: error: ISO C++ forbids declaration of âQEx
../src-QT4/kreplacements/kreplacements.h:288: error: expected â;â before â<â token
../src-QT4/kreplacements/kreplacements.h: In member function âvoid KConfigGroup::writeEn
../src-QT4/kreplacements/kreplacements.h:298: error: âdâ was not declared in this scope
../src-QT4/kreplacements/kreplacements.h: In member function âvoid KConfigGroup::writeEn:
../src-QT4/kreplacements/kreplacements.h:299: error: âdâ was not declared in this scope
../src-QT4/kreplacements/kreplacements.h: In member function âvoid KConfigGroup::writeEn
../src-QT4/kreplacements/kreplacements.h:300: error: âdâ was not declared in this scope
../src-QT4/kreplacements/kreplacements.h: In member function âT KConfigGroup::readEntry(
../src-QT4/kreplacements/kreplacements.h:302: error: âdâ was not declared in this scope
../src-QT4/kreplacements/kreplacements.h: In member function âQString KConfigGroup::read
../src-QT4/kreplacements/kreplacements.h:303: error: âdâ was not declared in this scope
../src-QT4/kreplacements/kreplacements.h: In member function âQStringList KConfigGroup::char)â:
../src-QT4/kreplacements/kreplacements.h:304: error: âdâ was not declared in this scope

Please please help me. It’s very urgent.
I tried googling and the answers mentioned are not working 

Regards,
Srikar.
+91 9293151370