Qt Systems module - publish subscribe

 Qt is a cross-platform C++ application framework. Qt's primary feature
 is its rich set of widgets that provide standard GUI functionality.
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 This package contains the Publish Subscribe part of the Qt Systems module.
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 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.