|| ( =app-admin/elektra-0.7*:0=[${MULTILIB_USEDEP}] >=app-admin/elektra-0.8.4:0=[${MULTILIB_USEDEP}] ) := is forbidden inside || (), and also broken. I suggest you just depend on new versions of elektra and forget about the old 0.7 thingie.
commit 572d19c1a2aa2f5cf3cb9e4b414407880ea61f3c Author: Michał Górny <mgorny@gentoo.org> AuthorDate: Tue Jun 21 21:46:58 2016 Commit: Michał Górny <mgorny@gentoo.org> CommitDate: Tue Jun 21 21:47:53 2016 media-libs/oyranos: Fix use of := in ||, #586314