qbittorrent-3.0.11.tar.gz has src/qtsingleapp dir, configure has --with-qtsingleapplication=system option. Seems it works fine for fedora: https://apps.fedoraproject.org/packages/qbittorrent/sources/spec
+*qbittorrent-3.0.11-r1 (13 Oct 2013) + + 13 Oct 2013; Markos Chandras <hwoarang@gentoo.org> + +qbittorrent-3.0.11-r1.ebuild, qbittorrent-9999.ebuild: + Use system qtsingleapplication per #487560 thanks to Nikoli +