While poking about Bug 144986, I've noticed: /usr/portage/games-rpg/nwmouse/nwmouse-0.1.ebuild:20:QA_TEXTREL_amd64="opt/nwn/nwmouse.so" /usr/portage/games-rpg/nwmouse/nwmouse-0.1.ebuild:21:QA_TEXTREL_x86="opt/nwn/nwmouse.so" Should actually be QA_TEXTRELS_{x86,amd64}, not QA_TEXTREL.
Fixed.