OK, the amount of gotchas with unigine-superposition 1.1 benchmark is too damn high, which is a pity because it's awesome!!!
- download the Linux (.run) version of Qt5.9, the latest version that works https://download.qt.io/official_releases/qt/5.9/5.9.0/
- make it executable
chmod a+x qt-opensource-linux-x64-5.9.0.run
- run it
./qt-opensource-linux-x64-5.9.0.run
- skip the registration bit and when prompt about what to install, check Qt5.9 too (top checkbox) and don't change the default path (or do it and adjust following commands). You migt try to not install the tools and see how that goes.
- use yay, yaourt or pakku / pamac to install
pakku -S --needed unigine-superposition
and I suggest you do that after asudo mount -o remount,size=20G,noatime /tmp
. If it ends with an error, justsudo pacman -U the-big-tar-file-in-tmp
- remove the Qt folder inside the unigine-super