How can I add a lib file to my project?

Hi
I a newbie to the Qt and started it for coding for symbian. I want to use symbian classes in Qt creator but every time I confronted with a new problem. I want to use etel3rdparty.lib classes in my project. For adding that library, I followed the instruction of Qt Docs, but it was not useful. My .pro file is:

Code:

---

QT       += core
 
QT       -= gui
 
TARGET = poiters
CONFIG   += console
CONFIG   -= app_bundle
 
TEMPLATE = app
HEADERS += etel3rdparty.h
 
 
SOURCES += main.cpp
 
 
win32:CONFIG(release, debug|release): LIBS += -L$$PWD/../../../../QtSDK/Symbian/SDKs/Symbian3Qt472/epoc32/release/armv5/lib/ -letel3rdparty
else:win32:CONFIG(debug, debug|release): LIBS += -L$$PWD/../../../../QtSDK/Symbian/SDKs/Symbian3Qt472/epoc32/release/armv5/lib/ -letel3rdpartyd
else:symbian: LIBS += -letel3rdparty
 
INCLUDEPATH += $$PWD/../../../../QtSDK/Symbian/SDKs/Symbian3Qt472/epoc32/release/armv5
DEPENDPATH += $$PWD/../../../../QtSDK/Symbian/SDKs/Symbian3Qt472/epoc32/release/armv5
 
symbian|win32: LIBS += -letel3rdparty

---

I always get this code error:
:-1: error: cannot find -letel3rdpartyd
:-1: error: collect2: ld returned 1 exit status

regards.