I am running Mint 18.2 Cinnamon 64 bit.
I am building kexi 3, part of the KDE suite. I have come to a halt because Mint only has Qt5-default version 5.5.1 as installed by the package manager. 5.8.0 is the minimum needed, (This fails when trying to build the breeze-icons)
I looked at the Qt5 site, but the download of Qt5 version 5.8 is absolutely humungous and obviously is not what I want (must be a full development package

best
Ian