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

Calculating dependencies ... done!
Dependency resolution took 0.89 s (backtrack: 0/20).


!!! The ebuild selected to satisfy "dev-util/trace-cmd:=" has unmet requirements.
- dev-util/trace-cmd-3.4::gentoo USE="python -test" PYTHON_SINGLE_TARGET="-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 ) )

(dependency required by "dev-util/kernelshark-2.3.2-r1::gentoo" [ebuild])
(dependency required by "=dev-util/kernelshark-2.3.2-r1" [argument])