These are the packages that would be merged, in order:

Calculating dependencies ... done!
Dependency resolution took 0.83 s (backtrack: 0/20).


!!! All ebuilds that could satisfy "=media-plugins/kodi-game-libretro-dosbox-9999" have been masked.
!!! One of the following masked packages is required to complete your request:
- media-plugins/kodi-game-libretro-dosbox-9999::gentoo (masked by: package.mask, missing keyword)
/Volumes/Disk 1/Repository/portage-git/profiles/package.mask:
# Michał Górny <mgorny@gentoo.org> (2020-11-10)
# This old Kodi version requires vulnerable dev-python/pillow
# and prevents users from upgrading.  Masked for the time being.
# Bug #729672.


For more information, see the MASKED PACKAGES section in the emerge
man page or refer to the Gentoo Handbook.