Many users have already moved their active projects to Qt 5 and we encourage also others to do so. With a high degree of source compatibility, we have ensured that switching to Qt 5 is smooth and straightforward. It should be noted that Qt 4.8.7 provides only the basic functionality to run Qt based applications on Mac OS X 10.10, full support is in Qt 5.Qt 4.8.7 is planned to be the last patch release of the Qt 4 series. Standard support is available until December 2015, after which extended support will be available. We recommend all active projects to migrate to Qt 5, as new operating systems and compilers with Qt 4.8 will not be supported. If you have challenges migrating to Qt 5, please contact us or some of our service partners for assistance
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