RequiredUseDefaults: version 0.15: profile: 'default/linux/amd64/17.0/musl' (48 total) failed REQUIRED_USE: exactly-one-of ( elogind systemd )
  RequiredUseDefaults: version 0.16: profile: 'default/linux/amd64/17.0/musl' (48 total) failed REQUIRED_USE: exactly-one-of ( elogind systemd )
  RequiredUseDefaults: version 0.17-r1: profile: 'default/linux/amd64/17.0/musl' (48 total) failed REQUIRED_USE: exactly-one-of ( elogind systemd )