The ebuild listed in summary uses a live eclass to fetch sources, and is not masked. Please update it to use a fetchable snapshot instead. Rationale is available in tracker bug #585712. CC-ing nerdboy@ since he added it, and comrel@ since he added it straight to maintainer-needed.
commit 81a0e50dc553309658a4cf769d35d0844ce45384 Author: Michał Górny <mgorny@gentoo.org> AuthorDate: Sun Jun 26 19:01:22 2016 Commit: Michał Górny <mgorny@gentoo.org> CommitDate: Sun Jun 26 19:03:32 2016 app-misc/vit: Use snapshot for building, #585718