Error: QNetworkReply: no such file or directory

Something is missing in the pro file:

TEMPLATE = app
TARGET = 
DEPENDPATH += .
INCLUDEPATH += .

# Input
HEADERS += hello.h
SOURCES += hello.cpp
QT += webkit

Or is there another problem?

$qmake -v
QMake version 2.01a
Using Qt version 4.7.0 in /opt/qtsdk-2010.05/qt/lib