app-crypt/gcr-3.16.0 is specified to only be compatible with python 2.7, but since 3.15.90, it is now also python 3 compatible https://bugzilla.gnome.org/show_bug.cgi?id=739449 Reproducible: Always
Fixed, thanks for reporting! + 19 Jun 2015; Alexandre Rostovtsev <tetromino@gentoo.org> gcr-3.16.0.ebuild: + Build system works with python3 (bug #552410, thanks to Olof Kindgren).