0.5.0 is sparc stable, 0.6.0+ have no ~sparc keyword. Maintainer, is it ok to try to keyword it?
Let's do it the easy way... + 19 Jun 2014; Michał Górny <mgorny@gentoo.org> libaacs-0.7.0-r1.ebuild: + Re-add ~sparc that most likely was mistakenly removed in revbump.