net-misc/mico is implementation of CORBA protocol. as a package, it's dead for twelve years. It fails to build in all configurations, partially due to C89/C++03 and partially due to bad build system or ebuild: https://bugs.gentoo.org/874090 https://bugs.gentoo.org/515938 https://bugs.gentoo.org/871237 https://bugs.gentoo.org/882479 https://bugs.gentoo.org/882633 https://bugs.gentoo.org/919509 https://bugs.gentoo.org/898086 It calls at least ar directly: https://bugs.gentoo.org/725192 It had broken tests (before it failed building altogether) https://bugs.gentoo.org/298101 And it's leaf package. Reproducible: Always