How to install Qt5 add-on modules

Hello, I am using Qt 5.1.1 binaries downloaded from http://qt-project.org/downloads. I need to install Qt System Info add-on module. There is no guide on how to build and install it. I downloaded the source code from https://qt.gitorious.org/qt/qtsystems and extracted it to a temporary folder. From the Visual Studio 2012 developer command prompt I cd to the directory containing qtsystems.pro file. Then I run qmake and nmake command. It gives the compilation error:
Code:

d:\temp\qt-qtsystems\src\publishsubscribe\qvaluespace_p.h(56) : fatal error C1083: Cannot open include file: 'qvaluespace.h': No such file or directory
Any help is appreciated...