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

Calculating dependencies ...

!!! Problem resolving dependencies for =sci-visualization/paraview-5.13.2-r2
 done!
Dependency resolution took 0.83 s (backtrack: 0/20).


!!! The ebuild selected to satisfy "=sci-visualization/paraview-5.13.2-r2" has unmet requirements.
- sci-visualization/paraview-5.13.2-r2::gentoo USE="openmp python qt6 sqlite webengine -boost -cg -doc -examples -ffmpeg -mpi -nvcontrol -plugins -test -tk" PYTHON_SINGLE_TARGET="python3_12"

  The following REQUIRED_USE flag constraints are unsatisfied:
    python? ( mpi )

  The above constraints are a subset of the following complete expression:
    python? ( mpi exactly-one-of ( python_single_target_python3_12 ) ) webengine? ( qt6 ) qt6? ( sqlite )