Install this version:
emerge -a =media-gfx/ufraw-thumbnailer-1.0
If this version is masked, you can unmask it using the autounmask tool or standard emerge options:
autounmask =media-gfx/ufraw-thumbnailer-1.0
Or alternatively:
emerge --autounmask-write -a =media-gfx/ufraw-thumbnailer-1.0
# Copyright 1999-2017 Gentoo Foundation
# Distributed under the terms of the GNU General Public License v2
# $Id$
EAPI=6
DESCRIPTION="Raw thumbnailer, based on ufraw-batch"
HOMEPAGE="ufraw.sourceforge"
LICENSE="GPL-2.0"
SLOT="0"
KEYWORDS="~amd64 ~x86"
IUSE=""
DEPEND="
media-gfx/ufraw
!media-gfx/raw-thumbnailer
!media-gfx/gnome-raw-thumbnailer
"
RDEPEND="${DEPEND}"
S=${WORKDIR}
src_install() {
insinto /usr/share/thumbnailers
doins ${FILESDIR}/ufraw.thumbnailer
}
media-gfx/ufraw !media-gfx/raw-thumbnailer !media-gfx/gnome-raw-thumbnailer
media-gfx/ufraw !media-gfx/raw-thumbnailer !media-gfx/gnome-raw-thumbnailer