emerge kde-apps/kde-apps-meta
Calculating dependencies... done!

emerge: there are no ebuilds to satisfy "app-crypt/qca:2[qt5(+)]".
(dependency required by "kde-apps/okular-19.04.2::kde-kit[crypt]" [ebuild])
(dependency required by "kde-apps/kdegraphics-meta-19.04.2::kde-kit" [ebuild])
(dependency required by "kde-apps/kde-apps-meta-19.04.2::kde-kit" [ebuild])
(dependency required by "kde-apps/kde-apps-meta" [argument])

did some research found a similar case 
 
FL-5789 (https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=&cad=rja&uact=8&ved=2ahUKEwjU4Ymao4_tAhVh_CoKHVaSAKoQFjAAegQIBBAC&url=https%3A%2F%2Fbugs.funtoo.org%2Fbrowse%2FFL-5789&usg=AOvVaw1AHl_Wj7yVlaK-sTsBTyE2)