smplayer is using internal .obj/moc_qtsingleapplication.o src/qtsingleapplication instead of system copy. You can use this as example of fixing qmake build system: https://code.google.com/p/quite-rss/source/detail?r=eb1892cbe9a0
+ 01 Jul 2015; Ben de Groot <yngwin@gentoo.org> + +files/smplayer-14.9.0.6966-unbundle-qtsingleapplication.patch, + +smplayer-14.9.0.6966-r1.ebuild: + Unbundle qtsingleapplication (bug #487544). Also fixes compilation with Qt 5.5 + (bug #552376).