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

Calculating dependencies ... done!
Dependency resolution took 0.84 s (backtrack: 0/20).


!!! All ebuilds that could satisfy "=app-misc/screen-5.0.1" have been masked.
!!! One of the following masked packages is required to complete your request:
- app-misc/screen-5.0.1::gentoo (masked by: package.mask)
/Volumes/Disk 1/Repository/portage-git/profiles/package.mask:
# Norbert Norbiros <norbiros@protonmail.com> (2025-04-01)
# Screen v5.0.0 has a lot of regressions
# https://lists.gnu.org/archive/html/screen-devel/2024-10/msg00007.html
# Unmask it after it is properly tested & fixed


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