needed to get rid of old ebuilds using old eclasses
Stable on alpha.
commit c554e83235d9e043a6b497278ff61ebe84ade653 Author: Rolf Eike Beer <eike@sf-mail.de> Date: Tue Mar 6 22:54:28 2018 +0100 sys-fs/mtools: stable 4.0.18-r2 for sparc, bug #648852
amd64 stable
x86 stable
arm stable
ppc64 stable
ppc stable, hppa lost stable keyword, old dropped.