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If you're installing calibre 2.20 on gentoo from an ebuild, then you must have qt5, still unstable in portage, installed from source. My guess would be that something is wrong there. Do you have other packages installed that depend on qt5 and are they working?
Many months ago, when calibre updated to use qt5, I just converted to installing the binary package (as others are recommending here) and it works fine on gentoo. All of its dependencies are self-contained in the binary package.
My UI (KDE) depends on qt, and I'm not about to even think about updating my system to qt5 until it goes stable in portage.
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