'QTimeZone' is missing on Qt 5.1 RC1

I couldn’t find QTimeZone library on 5.1 RC 1. Do I need to compile it my self? Quote from following URI http://qt-project.org/wiki/Qt-5-QTimeZone [qt-project.org] Proper time zone support is a long standing request and is planned to be implemented in Qt 5.1 as part of the new localization backend being developed using ICU.