It needs r600 or radeonsi GPU.
Closes: https://github.com/gentoo/gentoo/pull/8847
# Copyright 1999-2018 Gentoo Foundation
# Distributed under the terms of the GNU General Public License v2
+# Jan Vesely <jano.vesely@gmail.com> (15 June 2018)
+# Mesa clover only works on r600 or radeonsi GPUs. The corresponding
+# video_cards useflags are not available on arm
+media-libs/mesa opencl
+
# Alex Bennee <alex@bennee.com> (31 May 2018)
# bunch of dev-perl packages not yet keyworded
# and the i3 ebuild currently has RESTRICT="test" due to upstream bug