Ahoy ahoy, It was suggested that it may not have been obvious enough when I released QCA 2.1 in 2015. The "new" "regular" QCA tarballs are a replacement for the temporary qca-qt5 fork we had in early 2015. Since we merged the qt5 branch into master (as discussed on frameworks-devel in September 2015) it carries all the same Qt5/Qt4 co-installability changes we previously had in the qca-qt5 tarball.
Ivan Romanov also picked up maintenance it seems and released 2.1.3 a couple of days ago (yay!). So go pick that up if you haven't already transitioned away from the fork. HS
