* Found these USE flags for sys-block/tgt-1.0.80: U I - - fcoe : Add support for FCoE protocol - - fcp : Add support for new FC protocol - - ibmvio : Add support for IBM Virtual I/O these features were removed from tgt in 2011: https://github.com/fujita/tgt/commit/07801984855b955805fab04abeced7a31e21025d but are still present in the ebuilds: https://gitweb.gentoo.org/repo/gentoo.git/tree/sys-block/tgt/tgt-1.0.80.ebuild setting these would simply not do anything in the current version.