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Because of backward compatibility we need the application to be able to compile against quite dated Qt version.
**Source codes must be able to compile against Qt-5.2.1** We need to support Qt-5.2.1 because of Ubuntu 14.10. Newly added code thus must be able to compile against Qt-5.2.1. This state is going to be preserved at least as long as Ubuntu 14.10 is going to be [supported](https://wiki.ubuntu.com/Releases)(April 2019). After this period we will probably drop this requirement. (Ubuntu 16.10 contains Qt-5.5.1.)
**The project file restrict the usage to Qt-5.3 and newer.** This is because we want to discourage the users to compile the application against Qt-5.2. Qt-5.2.1 contains a bug which causes the application to occasionally crash on drag&drop events.
**We recommend the usage of Qt-5.4 and later.** Usefull functionality was added in this release.