Some manual – laptop – cleaning was required to set up ir properly – like

emerge --uaDN --with-bdeps=y --verbose-conflicts=y @world
emerge -ac app-emulation/vagrant
emerge --depclean
emerge -uaDN --with-bdeps=y @world
emerge --depclean
emerge -a app-emulation/vagrant

Finally

brilius@localhost  ~  vagrant box add laravel/homestead

is working w/o/ additional errors, preventing e. g. REST client from contacting servers due to some problematic slot conflicts.

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