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

Calculating dependencies ... done!
Dependency resolution took 1.54 s (backtrack: 0/20).


!!! Multiple package instances within a single package slot have been pulled
!!! into the dependency graph, resulting in a slot conflict:

dev-python/flit-core:0

  (dev-python/flit-core-4.1.0:0/0::gentoo, ebuild scheduled for merge) USE="-test -verify-provenance" PYTHON_TARGETS="python3_14 -pypy3_12 -python3_12 -python3_13 -python3_14t (-python3_15) (-python3_15t)" pulled in by
    (no parents that aren't satisfied by other packages in this slot)

  (dev-python/flit-core-3.12.0:0/0::gentoo, ebuild scheduled for merge) USE="-test -verify-provenance" PYTHON_TARGETS="python3_14 -python3_12 -python3_13 -python3_14t (-python3_15) (-python3_15t)" pulled in by
    <dev-python/flit-core-4[python_targets_python3_12(-)?,python_targets_python3_13(-)?,python_targets_python3_14t(-)?,python_targets_python3_14(-)?,python_targets_python3_15t(-)?,python_targets_python3_15(-)?] required by (dev-python/cloudpickle-3.1.2:0/0::gentoo, ebuild scheduled for merge) USE="-test" PYTHON_TARGETS="python3_14 -python3_12 -python3_13 -python3_14t (-python3_15) (-python3_15t)"
    ^                                                                                                                                          ^                                                                                                                                                                                                                                                                                                                                                                                                                                                           


It may be possible to solve this problem by using package.mask to
prevent one of those packages from being selected. However, it is also
possible that conflicting dependencies exist such that they are
impossible to satisfy simultaneously.  If such a conflict exists in
the dependencies of two different packages, then those packages can
not be installed simultaneously.

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


The following USE changes are necessary to proceed:
 (see "package.use" in the portage(5) man page for more details)
# required by dev-python/spyder-6.1.7::gentoo
# required by dev-python/spyder-terminal-1.3.1::gentoo
# required by =dev-python/spyder-terminal-1.3.1 (argument)
>=dev-python/qtpy-2.4.3-r3 svg webengine quick
# required by dev-python/qtpy-2.4.3-r3::gentoo
# required by dev-python/superqt-0.9.0::gentoo
# required by dev-python/spyder-6.1.7::gentoo
# required by dev-python/spyder-terminal-1.3.1::gentoo
# required by =dev-python/spyder-terminal-1.3.1 (argument)
>=dev-python/pyqt6-6.11.0-r1 quick svg

!!! The ebuild selected to satisfy "dev-python/pyqt6[widgets?,xml?]" has unmet requirements.
- dev-python/pyqt6-6.11.0-r1::gentoo USE="X dbus gui network opengl printsupport sql ssl widgets xml -bluetooth -debug -designer -examples -gles2-only -help -multimedia -nfc -pdfium -positioning -qml -quick -quick3d -remoteobjects -scxml -sensors -serialport -spatialaudio -speech -svg -testlib -vulkan -wayland -webchannel -websockets" PYTHON_TARGETS="python3_14 -python3_12 -python3_13 (-python3_15)"

  The following REQUIRED_USE flag constraints are unsatisfied:
    quick? ( qml )

  The above constraints are a subset of the following complete expression:
    designer? ( gui widgets ) help? ( gui widgets ) multimedia? ( gui network ) opengl? ( gui ) pdfium? ( gui ) printsupport? ( gui widgets ) qml? ( network ) quick3d? ( gui qml ) quick? ( gui qml ) remoteobjects? ( network ) scxml? ( gui ) spatialaudio? ( multimedia ) sql? ( widgets ) svg? ( gui ) testlib? ( gui widgets ) vulkan? ( gui ) webchannel? ( network ) websockets? ( network ) widgets? ( gui ) any-of ( python_targets_python3_12 python_targets_python3_13 python_targets_python3_14 python_targets_python3_15 )

(dependency required by "dev-python/qtpy-2.4.3-r3::gentoo" [ebuild])
(dependency required by "dev-python/spyder-6.1.7::gentoo" [ebuild])
(dependency required by "dev-python/spyder-terminal-1.3.1::gentoo" [ebuild])
(dependency required by "=dev-python/spyder-terminal-1.3.1" [argument])