2.13 fixes compilation against kernel 4.12. latest version in portage is 2.12.
It seems this was bumped, https://gitweb.gentoo.org/repo/gentoo.git/commit/?id=4dbd255403e96f29de759dfd64e0dc45d0bb8a95 But it would be nice to stabilize that version as 4.12.x kernel is now in stable Thanks
commit 4dbd255403e96f29de759dfd64e0dc45d0bb8a95 Author: Anthony G. Basile <blueness@gentoo.org> Date: Tue Jul 25 15:47:21 2017 -0400 net-firewall/xtables-addons: version bump to 2.13 Package-Manager: Portage-2.3.6, Repoman-2.3.1