I want to build my application on Ubuntu. The last versions have been tested and programmed under Windows, because it is a multiplatform application. Sadly, under Ubuntu the systray icon did not work as I tried to compile on Ubuntu (the icon appeared next to the launcher). The icon is a must-have for my application.
I've heard this comes from the version of Qt, since 5.0 the SniQt that makes an AppIndicator would not work any more. So I figured, if I compile my application with Qt 4.x, it must work.
But how do I install this "old" version?