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 "=xfce-base/xfce4-settings-4.21.3" have been masked.
!!! One of the following masked packages is required to complete your request:
- xfce-base/xfce4-settings-4.21.3::gentoo (masked by: package.mask)
/Volumes/Disk 1/Repository/portage-git/profiles/package.mask:
# Michał Górny <mgorny@gentoo.org> (2025-03-17)
# Xfce 4.22 prereleases.  Masked because they tend to be quite unstable.


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