I think
dnf install libpng.i686
should solve the thing on current Fedora (23 by now) in theory, though there's apparently a conflict with the 64 bit version which - as X and other stuff depends on it - you don't want to remove or break. Some isolated environment for that might solve that in the future (may xdg app save us one day) without the performance loss of a full VM. Edit: Actually I was able to install libpng.i686 without conflicts when installing libpng-devel.i686 which did the trick for some reason. However I also needed a few more package, so here's the complete list of what I installed so far: libpng-devel.686 libpng12.i686 libX11.i686 libXext.i686 libXxf86vm.i686 mesa-libGL-devel.i686 libgudev.i686 That gets me a bit further but still not to the end.
