base-system@gentoo.org Gentoo Base System Install deprecated 'egrep' and 'fgrep' wrappers for 'grep -E' and 'grep -F' respectively. GNU grep 3.8 onwards warns about their usage by default, but the versions installed by this flag do not. No deprecation warnings are emitted when this flag is enabled. Run expensive tests (mostly CPU intensive). cpe:/a:gnu:grep grep