title: Multiple Qt versions on Linux
body: <p>I am currenyly using Debian Jessie and I have Qt Creator installed with Qt 5.3.3. It works fine, however there are some issues like QSystemTrayIcon not appearing properly, which I understand doesn't occur on versions earlier than 5.0.0, so I would like to be able to switch which version I am building with. Where can I download the necessary files that I can then point to from the Qt Versions tab in Qt Creator? Currently I can only choose 5.3.3. I would need something like 4.8.6 too.</p>