I'd say something got messed up with your qt5 environment somehow.
As long as it's reported as working on clean Mageia installations, I don't think I'll worry about making any changes to Sigil's build/install process. Though I may add something to the wiki about linux crashes and the launch script for future reference. Still seems a bit odd to me that a QSurface error is what's causing a crash on first launching Sigil when the qt libs can't be found. I would normally expect a platform plugin error under those conditions. *shrug*
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