I just noticed unico_1.0.3+14.04.20140109.orig.tar.gz up here: https://launchpad.net/ubuntu/vivid/+source/unico
Sure, and we also need to make it multilib so the themes for 32-bit and 64-bit gtk applications can properly match.
+*gtk-engines-unico-1.0.3_pre20140109 (18 Mar 2015) + + 18 Mar 2015; Alexandre Rostovtsev <tetromino@gentoo.org> + +gtk-engines-unico-1.0.3_pre20140109.ebuild: + Version bump, fixes performance issues with >=gtk+-3.10 (bug #543558, thanks + to Sebastian Pipping). Enable multilib support.