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

Calculating dependencies ... done!
Dependency resolution took 0.82 s (backtrack: 0/20).


!!! All ebuilds that could satisfy "=sci-physics/bullet-3.22b" have been masked.
!!! One of the following masked packages is required to complete your request:
- sci-physics/bullet-3.22b::gentoo (masked by: package.mask)
/Volumes/Disk 1/Repository/portage-git/profiles/package.mask:
# Joonas Niilola <juippis@gentoo.org> (2022-04-29)
# Apparently the "b" in version means "beta". 3.24 is available, we
# should update to that. #841437


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