Thanks.
@ fauli: The ebuild needs poppler[cairo] but: EAPI.incompatible 1 mail-client/claws-mail-pdf-viewer/claws-mail-pdf-viewer-0.9.3.ebuild: DEPEND: Use deps are not allowed in EAPI 0: 'app-text/poppler[cairo]' So feel free to bump the eapi, add the use deps and keyword for amd64 at same time.
All changes apllied.