Qt 5 Systems development files

 Qt is a cross-platform C++ application framework. Qt's primary feature
 is its rich set of widgets that provide standard GUI functionality.
 .
 This package contains the header development files used for building Qt 5
 applications using Qt Systems libraries.
 .
 WARNING: This module is not an official part of Qt 5, but instead a git
 snapshot of an ongoing development. The package is very likely to
 change in a binary incompatible way, and no guarantees are given.