Install this version:
emerge -a =net-print/prp085iiit-9999
If this version is masked, you can unmask it using the autounmask tool or standard emerge options:
autounmask =net-print/prp085iiit-9999
Or alternatively:
emerge --autounmask-write -a =net-print/prp085iiit-9999
# Copyright 1999-2017 Gentoo Foundation
# Distributed under the terms of the GNU General Public License v2
EAPI=7
inherit cmake git-r3
DESCRIPTION="Driver for Tysso PRP-085IIIT printer"
HOMEPAGE="https://www.kaa.org.ua/ru/25-programs/42-driver_prp085iiit.html"
EGIT_REPO_URI="https://github.com/Oleh-Kravchenko/prp085iiit.git"
LICENSE="GPL-2"
SLOT="0"
KEYWORDS="~amd64 ~x86"
IUSE=""
DEPEND="net-print/cups"
RDEPEND="${DEPEND}"
net-print/cups
net-print/cups