Reported in bug #430804 by Joost Ruis from sabayon.
There is no such thing as app-text/poppler-qt4 in Portage and the ebuild has the correct dependency of: $ grep poppler *.ebuild qcomicbook-0.8.2.ebuild: app-text/poppler[qt4]" qcomicbook-0.9.0.ebuild: app-text/poppler[qt4]"