The package uses doman/newman on a compressed file which is invalid per PMS: doman man/subcheck.8.gz
commit 3853d43ba43ff6fa34c892fffab0e699449d3625 Author: Mikle Kolyada <zlogene@gentoo.org> Date: Thu Jul 26 18:18:22 2018 +0300 media-video/subcheck: revision bump (EAPI=7) Do not install pre-compressed man Package-Manager: Portage-2.3.40, Repoman-2.3.9