Please regenerate the Manifest.
@idl0r: CCing you, as the previous maintainer. Do you still have the ut_linux_mgr_5.20.zip distfile?
This has been fixed implicitly: commit 323e1ce8c44610db899947ef412cc89aedd26307 Author: David Seifert <soap@gentoo.org> Date: Wed Jan 3 19:37:15 2018 +0100 sys-block/megamgr: Port to EAPI 6 Package-Manager: Portage-2.3.19, Repoman-2.3.6 Thanks.