The latest Mono release is: 4.8 (4.8.0.495) http://www.mono-project.com/download/ https://releases.xamarin.com/stable-release-cycle-9/ This is new stable release.
Fixed in commit 1675ee0e6d8fb5ec39ccbacf4b4385b57725f1e6 Author: Mikhail Pukhlikov <cynede@gentoo.org> AuthorDate: Wed Mar 1 16:01:02 2017 +0400 Commit: Mikhail Pukhlikov <cynede@gentoo.org> CommitDate: Wed Mar 1 16:01:02 2017 +0400 dev-lang/mono: bump into 4.8.0.495 Package-Manager: Portage-2.3.3, Repoman-2.3.1