{'description': {'en': 'musl clang/libc++ overlay'},
 'feed': ['https://github.com/karlguy/musl-clang/commits/master.atom'],
 'homepage': 'https://github.com/karlguy/musl-clang/',
 'name': 'musl-clang',
 'owner': [{'email': 'bjornpagen@gmail.com',
            'name': 'Bjorn Pagen',
            'type': 'person'}],
 'quality': 'experimental',
 'source': [{'type': 'git', 'uri': 'https://github.com/karlguy/musl-clang.git'},
            {'type': 'git',
             'uri': 'git+ssh://git@github.com/karlguy/musl-clang.git'}],
 'status': 'unofficial'}
pkgcore 0.12.28

$ pmaint --config /var/lib/repo-mirror-ci/data-sync/etc/portage sync musl-clang
WARNING:pkgcore:mv repo at '/var/lib/repo-mirror-ci/sync/mv', doesn't specify masters in metadata/layout.conf. Please explicitly set masters (use "masters =" if the repo is standalone).
WARNING:pkgcore:jmbsvicetto repo at '/var/lib/repo-mirror-ci/sync/jmbsvicetto', doesn't specify masters in metadata/layout.conf. Please explicitly set masters (use "masters =" if the repo is standalone).
WARNING:pkgcore:maekke repo at '/var/lib/repo-mirror-ci/sync/maekke', doesn't specify masters in metadata/layout.conf. Please explicitly set masters (use "masters =" if the repo is standalone).
*** syncing musl-clang
Already up to date.
*** synced musl-clang
 * Sync succeeded
$ git log --format=%ci -1
$ git show -q --pretty=format:%G? HEAD
$ pmaint --config /var/lib/repo-mirror-ci/data/etc/portage regen --use-local-desc --pkg-desc-index -t 32 musl-clang
 * dev-qt/qtcore-5.9.3: failed sourcing ebuild: flag-o-matic: EAPI 6 not supported, (flag-o-matic.eclass, line  18:  called die)
 * Cache regen failed with 1