Qmake variables pointing to the Qt sources do not resolve correctly. E.g. $$QT.activeqt.sources

Tested package: Digia Qt5 beta 1 Windows installer 13.8.2012

E.g. examples/activeqt/simple/simple.pro has this definition, which results in wrong path for .rc file:

RC_FILE	 = $$QT.activeqt.sources/control/qaxserver.rc

Looking through the files in mkspecs/modules, there are some discrepancies on how the source variable is defined:

1) Some use variable $$QT_MODULE_BASE:

E.g. qt_activeqt.pri: QT.activeqt.sources = $$QT_MODULE_BASE/src/activeqt

2) Some have patched correct path (though mixing slashes and backslashes):

E.g. qt_core.pri: QT.core.sources = C:\\Users\\foobar\\Qt5.0.0beta1\\Desktop\\Qt\\5.0.0-beta1\\msvc2010_64/src/corelib

3) Some still point to work directory in build machine:

E.g. qt_qml.pri: QT.qml.sources = Q:/qt5_workdir/w/s/qtdeclarative/src/qml

Also the other variables defined in these files will get incorrect values, as they rely on various other variables to be set, such as $$QT_MODULE_PLUGIN_BASE or $$QT_MODULE_BIN_BASE. These all resolve to empty string in the installation.