99999999 seems to be a typo and should be 9999 as [1] suggests. [1] http://www.gentoo.org/proj/en/devrel/handbook/handbook.xml?full=1 Reproducible: Always
The 99999999 ebuild was introduced because of the introduction of YYYYMMDD ebuilds, and it's as valid as a version now as it was then. *mtd-utils-99999999 (10 Mar 2009) 10 Mar 2009; Raúl Porcel <armin76@gentoo.org> -mtd-utils-9999.ebuild, +mtd-utils-99999999.ebuild: Replace 9999 by 99999999, so its always newer The developer handbook is both dated and incomplete.