The ebuild seems to be missing SRC_URI arrows to rename the distfile: v1.18.0.tar.gz
commit f79f3d63c6a19829b1bb333bea9d185e89e3638e (HEAD -> master, origin/master, origin/HEAD) Author: Manuel Rüger <mrueg@gentoo.org> Date: Mon May 29 00:17:41 2017 +0200 sys-auth/ykpers: Fix distfile naming Package-Manager: Portage-2.3.6, Repoman-2.3.1