Needs a port to a newer EAPI (ideally 7). As this package is maintainer-needed, it is possible it could be last-rited if nobody steps up.
https://gitweb.gentoo.org/repo/gentoo.git/commit/?id=d35ffa172d4f5f60ef54ff43b5f9b3f4265cb374 https://gitweb.gentoo.org/repo/gentoo.git/commit/?id=5cec2faa9e3f8e18a20d9f45461e431309003118 https://gitweb.gentoo.org/repo/gentoo.git/commit/?id=9c8633de85e5ade3b086b6b58c8bfce7df2754e5 https://gitweb.gentoo.org/repo/gentoo.git/commit/?id=695203894eb9bd0d7be99ec381fadf50ff48a027 https://gitweb.gentoo.org/repo/gentoo.git/commit/?id=6f348cb1f463b8ef951fdc0a4f06102e616334b6 https://gitweb.gentoo.org/repo/gentoo.git/commit/?id=6f348cb1f463b8ef951fdc0a4f06102e616334b6
The SRC_URI of all of them starting with https://dev.gentoo.org/~flameeyes/avasys/${PN}-${MY_PVR}... But this user domain is actually dead.