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

Calculating dependencies ... done!
Dependency resolution took 0.88 s (backtrack: 0/20).


The following USE changes are necessary to proceed:
 (see "package.use" in the portage(5) man page for more details)
# required by media-gfx/alembic-1.8.6-r1::gentoo[python]
# required by =media-gfx/alembic-1.8.6-r1 (argument)
>=dev-libs/imath-3.1.12-r1 python_single_target_python3_12

!!! The ebuild selected to satisfy "dev-libs/imath:=[python,python_single_target_python3_12(-)?]" has unmet requirements.
- dev-libs/imath-3.1.12-r1::gentoo USE="python -doc -large-stack -test" PYTHON_SINGLE_TARGET="python3_14 -python3_12 -python3_13"

  The following REQUIRED_USE flag constraints are unsatisfied:
    python? ( exactly-one-of ( python_single_target_python3_12 python_single_target_python3_13 python_single_target_python3_14 ) )

(dependency required by "media-gfx/alembic-1.8.6-r1::gentoo" [ebuild])
(dependency required by "=media-gfx/alembic-1.8.6-r1" [argument])