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

Calculating dependencies ...

!!! Problem resolving dependencies for =sci-physics/lammps-20230802
 done!
Dependency resolution took 0.83 s (backtrack: 0/20).


!!! The ebuild selected to satisfy "=sci-physics/lammps-20230802" has unmet requirements.
- sci-physics/lammps-20230802::gentoo USE="python -cuda -examples -gzip -hip -lammps-memalign -mpi -opencl -test" PYTHON_TARGETS="-python3_12"

  The following REQUIRED_USE flag constraints are unsatisfied:
    python? ( python_targets_python3_12 )

  The above constraints are a subset of the following complete expression:
    python? ( any-of ( python_targets_python3_12 ) ) at-most-one-of ( cuda opencl hip )