INSTALLING Qt Source Package Version 5.5.1.

For instructions on building and installing Qt for each supported platform,
please see http://doc.qt.io/qt-5.5/build-sources.html,
or follow one of these links:

Mac OS X:         http://doc.qt.io/qt-5.5/osx-building.html
Windows:          http://doc.qt.io/qt-5.5/windows-building.html
X11 Platforms:    http://doc.qt.io/qt-5.5/linux-building.html
Windows CE:       http://doc.qt.io/qt-5.5/install-wince.html