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 "=sys-libs/argp-standalone-1.5.0" have been masked.
!!! One of the following masked packages is required to complete your request:
- sys-libs/argp-standalone-1.5.0::gentoo (masked by: package.mask)
/Volumes/Disk 1/Repository/portage-git/profiles/default/linux/package.mask:
# Sam James <sam@gentoo.org> (2025-01-10)
# These packages are only relevant on musl systems.


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