The mumble live ebuild can't be built due to a missing Git submodule. GitHub PR adds it alongside a USE flag for it.
Waiting for the PR. Please take the following change into account: https://gitweb.gentoo.org/repo/gentoo.git/commit/?id=a4e79c344e65c68c8a5fe19ce8bb50fdc4dbc03e
Ah, oops. I missed that latest change. PR should be good now.
The bug has been closed via the following commit(s): https://gitweb.gentoo.org/repo/gentoo.git/commit/?id=558799d2efe85093aadb02b9e53bf0805c3295dd commit 558799d2efe85093aadb02b9e53bf0805c3295dd Author: Nikos Chantziaras <realnc@gmail.com> AuthorDate: 2018-07-09 13:35:31 +0000 Commit: Lars Wendler <polynomial-c@gentoo.org> CommitDate: 2018-07-09 14:26:09 +0000 media-sound/mumble: Add rnnoise USE flag and description Closes: https://bugs.gentoo.org/660788 Package-Manager: Portage-2.3.41, Repoman-2.3.9 Closes: https://github.com/gentoo/gentoo/pull/9155 media-sound/mumble/metadata.xml | 1 + media-sound/mumble/mumble-9999.ebuild | 3 ++- 2 files changed, 3 insertions(+), 1 deletion(-)