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

Calculating dependencies ... done!
Dependency resolution took 2.97 s (backtrack: 6/20).

[ebuild  N     ] dev-build/b2-5.5.3::gentoo  USE="-examples" 1198 KiB
[ebuild  N     ] dev-cpp/tclap-1.2.5::gentoo  USE="-doc" 4044 KiB
[ebuild  N     ] dev-cpp/glog-0.6.0-r1:0/1::gentoo  USE="libunwind -gflags -llvm-libunwind -test" 189 KiB
[ebuild  N     ] dev-cpp/yaml-cpp-0.9.0-r1:0/0.9::gentoo  USE="-test" 1032 KiB
[ebuild  N     ] dev-libs/crc32c-1.1.2-r2::gentoo  USE="-test" 30 KiB
[ebuild  N     ] app-arch/snappy-1.2.2-r1:0/1.1::gentoo  USE="-test" CPU_FLAGS_X86="avx avx2" 1083 KiB
[ebuild  N     ] dev-libs/darts-0.32h_pre20181117064816::gentoo  38 KiB
[ebuild  N     ] dev-libs/rapidjson-1.1.0_p20250205::gentoo  USE="-doc -examples -test" 1091 KiB
[ebuild  N     ] dev-libs/boost-1.91.0-r2:0/1.91.0::gentoo  USE="bzip2 context nls python stacktrace zlib -debug -doc -icu -lzma -mpi -numpy -test -test-full -tools -zstd" PYTHON_TARGETS="python3_14 -python3_12 -python3_13" 199785 KiB
[ebuild  N     ] dev-libs/leveldb-1.23-r6:0/1::gentoo  USE="snappy tcmalloc -test" 238 KiB
[ebuild     U  ] dev-python/installer-1.1.0::gentoo [0.7.0::gentoo] USE="-test -verify-provenance%" PYTHON_TARGETS="python3_14* -pypy3_12% -python3_12 -python3_13* -python3_14t (-python3_15) (-python3_15t) (-pypy3_11%) (-python3_11%) (-python3_13t%)" 924 KiB
[ebuild  N     ] app-admin/chrpath-0.18::gentoo  52 KiB
[ebuild     U  ] dev-python/gpep517-23::gentoo [19::gentoo] USE="-test" PYTHON_TARGETS="python3_14* -pypy3_12% -python3_12 -python3_13* -python3_14t (-python3_15) (-python3_15t) (-pypy3_11%) (-python3_11%) (-python3_13t%)" 31 KiB
[ebuild     U  ] dev-python/flit-core-4.1.0::gentoo [3.12.0::gentoo] USE="-test -verify-provenance%" PYTHON_TARGETS="python3_14* -pypy3_12% -python3_12 -python3_13* -python3_14t (-python3_15) (-python3_15t) (-pypy3_11%) (-python3_11%) (-python3_13t%)" 54 KiB
[ebuild     U  ] dev-python/packaging-26.3::gentoo [26.0::gentoo] USE="-test -verify-provenance" PYTHON_TARGETS="python3_14* -pypy3_12% -python3_12 -python3_13* -python3_14t (-python3_15) (-python3_15t) (-pypy3_11%) (-python3_11%) (-python3_13t%)" 307 KiB
[ebuild     U  ] dev-python/more-itertools-11.2.1::gentoo [10.8.0::gentoo] USE="-doc" PYTHON_TARGETS="python3_14* -pypy3_12% -python3_12 -python3_13* -python3_14t (-python3_15) (-python3_15t) (-pypy3_11%) (-python3_11%) (-python3_13t%)" 151 KiB
[ebuild     U  ] dev-python/trove-classifiers-2026.9.21.13::gentoo [2026.1.14.14::gentoo] USE="-test -verify-provenance" PYTHON_TARGETS="python3_14* -pypy3_12% -python3_12 -python3_13* -python3_14t (-python3_15) (-python3_15t) (-pypy3_11%) (-python3_11%) (-python3_13t%)" 17 KiB
[ebuild     U  ] dev-python/pathspec-1.1.1::gentoo [1.0.4::gentoo] USE="-verify-provenance" PYTHON_TARGETS="python3_14* -pypy3_12% -python3_12 -python3_13* -python3_14t (-python3_15) (-python3_15t) (-pypy3_11%) (-python3_11%) (-python3_13t%)" 133 KiB
[ebuild     U  ] dev-python/platformdirs-4.13.5::gentoo [4.9.4::gentoo] USE="-test -verify-provenance" PYTHON_TARGETS="python3_14* -pypy3_12% -python3_12 -python3_13* -python3_14t (-python3_15) (-python3_15t) (-pypy3_11%) (-python3_11%) (-python3_13t%)" 61 KiB
[ebuild     U  ] dev-python/wheel-0.48.0::gentoo [0.46.3::gentoo] USE="-test -verify-provenance" PYTHON_TARGETS="python3_14* -pypy3_12% -python3_12 -python3_13* -python3_14t (-python3_15) (-python3_15t) (-pypy3_11%) (-python3_11%) (-python3_13t%)" 65 KiB
[ebuild     U  ] dev-python/jaraco-context-6.1.2::gentoo [6.1.1::gentoo] USE="-test" PYTHON_TARGETS="python3_14* -pypy3_12% -python3_12 -python3_13* -python3_14t (-python3_15) (-python3_15t) (-pypy3_11%) (-python3_11%) (-python3_13t%)" 17 KiB
[ebuild     U  ] dev-python/pyproject-metadata-0.12.1::gentoo [0.11.0::gentoo] USE="-test -verify-provenance" PYTHON_TARGETS="python3_14* -python3_12 -python3_13* -python3_14t (-python3_15) (-python3_15t) (-pypy3_11%) (-python3_11%) (-python3_13t%)" 48 KiB
[ebuild     U  ] dev-python/editables-0.6::gentoo [0.5::gentoo] USE="-test" PYTHON_TARGETS="python3_14* -pypy3_12% -python3_12 -python3_13* -python3_14t (-python3_15) (-python3_15t) (-pypy3_11%) (-python3_11%) (-python3_13t%)" 19 KiB
[ebuild  N     ] dev-python/tomlkit-0.15.2::gentoo  USE="-test" PYTHON_TARGETS="python3_14 -pypy3_12 -python3_12 -python3_13 -python3_14t (-python3_15) (-python3_15t)" 187 KiB
[ebuild     U  ] dev-python/jaraco-functools-4.6.0::gentoo [4.4.0::gentoo] USE="-test" PYTHON_TARGETS="python3_14* -pypy3_12% -python3_12 -python3_13* -python3_14t (-python3_15) (-python3_15t) (-pypy3_11%) (-python3_11%) (-python3_13t%)" 21 KiB
[ebuild     U  ] dev-python/jaraco-text-4.3.0::gentoo [4.2.0::gentoo] USE="-test" PYTHON_TARGETS="python3_14* -pypy3_12% -python3_12 -python3_13* -python3_14t (-python3_15) (-python3_15t) (-pypy3_11%) (-python3_11%) (-python3_13t%)" 21 KiB
[ebuild     U  ] dev-python/setuptools-84.0.0::gentoo [81.0.0::gentoo] USE="-test" PYTHON_TARGETS="python3_14* -pypy3_12% -python3_12 -python3_13* -python3_14t (-python3_15) (-python3_15t) (-pypy3_11%) (-python3_11%) (-python3_13t%)" 1142 KiB
[ebuild  N     ] dev-python/vcs-versioning-2.6.0::gentoo  USE="-test -verify-provenance" PYTHON_TARGETS="python3_14 -pypy3_12 -python3_12 -python3_13 -python3_14t (-python3_15) (-python3_15t)" 163 KiB
[ebuild     U  ] dev-python/setuptools-scm-10.3.4::gentoo [9.2.2::gentoo] USE="-test -verify-provenance" PYTHON_TARGETS="python3_14* -pypy3_12% -python3_12 -python3_13* -python3_14t (-python3_15) (-python3_15t) (-pypy3_11%) (-python3_11%) (-python3_13t%)" 77 KiB
[ebuild  N     ] dev-libs/marisa-0.3.1-r2::gentoo  USE="python -debug -tools" PYTHON_TARGETS="python3_14 -python3_12 -python3_13" 208 KiB
[ebuild     U  ] dev-python/pluggy-1.7.0::gentoo [1.6.0::gentoo] USE="-test -verify-provenance%" PYTHON_TARGETS="python3_14* -pypy3_12% -python3_12 -python3_13* -python3_14t (-python3_15) (-python3_15t) (-pypy3_11%) (-python3_11%) (-python3_13t%)" 121 KiB
[ebuild     U  ] dev-python/hatchling-1.32.4::gentoo [1.29.0::gentoo] USE="-test" PYTHON_TARGETS="python3_14* -pypy3_12% -python3_12 -python3_13* -python3_14t (-python3_15) (-python3_15t) (-pypy3_11%) (-python3_11%) (-python3_13t%)" 5239 KiB
[ebuild   R    ] dev-python/hatch-vcs-0.5.0::gentoo  USE="-test" PYTHON_TARGETS="python3_14* -pypy3_12% -python3_12 -python3_13* -python3_14t (-python3_15) (-python3_15t) (-pypy3_11%) (-python3_11%) (-python3_13t%)" 12 KiB
[ebuild     U  ] dev-python/scikit-build-core-1.1.1::gentoo [0.12.2::gentoo] USE="-test -verify-provenance" PYTHON_TARGETS="python3_14* -python3_12 -python3_13* (-python3_15) (-pypy3_11%) (-python3_11%)" 505 KiB
[ebuild     U  ] dev-python/pybind11-3.1.0::gentoo [3.0.2::gentoo] USE="-test" PYTHON_TARGETS="python3_14* -python3_12 -python3_13* (-python3_15) (-pypy3_11%) (-python3_11%)" 962 KiB
[ebuild  N     ] app-i18n/opencc-1.1.9:0/1.1::gentoo  USE="python -debug -doc -test" PYTHON_SINGLE_TARGET="python3_14 -python3_12 -python3_13" 3343 KiB
[ebuild  N     ] app-i18n/librime-1.16.1:0/1-1.16.1::gentoo  USE="-debug -test" 2588 KiB

Total: 37 packages (20 upgrades, 16 new, 1 reinstall), Size of downloads: 225176 KiB

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

dev-python/pathspec:0

  (dev-python/pathspec-1.1.1:0/0::gentoo, ebuild scheduled for merge) USE="-verify-provenance" PYTHON_TARGETS="python3_14 -pypy3_12 -python3_12 -python3_13 -python3_14t (-python3_15) (-python3_15t)" pulled in by
    >=dev-python/pathspec-0.12.0[python_targets_python3_12(-)?,python_targets_python3_13(-)?,python_targets_python3_14(-)?,python_targets_python3_15(-)?] required by (dev-python/scikit-build-core-1.1.1:0/0::gentoo, ebuild scheduled for merge) USE="-test -verify-provenance" PYTHON_TARGETS="python3_14 -python3_12 -python3_13 (-python3_15)"
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      
    >=dev-python/pathspec-0.10.1[python_targets_pypy3_12(-)?,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/hatchling-1.32.4:0/0::gentoo, ebuild scheduled for merge) USE="-test" PYTHON_TARGETS="python3_14 -pypy3_12 -python3_12 -python3_13 -python3_14t (-python3_15) (-python3_15t)"
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  

  (dev-python/pathspec-1.0.4:0/0::gentoo, installed) USE="-verify-provenance" PYTHON_TARGETS="python3_13 -pypy3_11 -python3_11 -python3_12 -python3_13t -python3_14 -python3_14t" pulled in by
    >=dev-python/pathspec-0.9.0[python_targets_python3_13(-)] required by (dev-python/mypy-1.19.1:0/0::gentoo, installed) USE="-debug (-native-extensions) -test" PYTHON_TARGETS="python3_13 -python3_11 -python3_12 -python3_14"
                                                                                                                                                                                                                                                                                                                                                                                       


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. You may want to try a larger value of
the --backtrack option, such as --backtrack=30, in order to see if
that will solve this conflict automatically.

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