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update to 3.6.0 https://github.com/taskjuggler/TaskJuggler/releases
Version 3+ is complete rewrite to ruby. I'd suggest you to start with new package, if you want to get taskjuggler 3 into Fedora. Ruby taskjuggler misses some important features - most importantly UI. OTOH, taskjuggler 2, written with qt3 will slowly die anyway, as rewrite to qt4 or qt5 is very difficult task (two attempts so far failed).
OK I'll close the bug