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

Calculating dependencies ...

!!! Problem resolving dependencies for =sci-libs/nlopt-2.7.1-r100
 done!
Dependency resolution took 0.84 s (backtrack: 0/20).


!!! The ebuild selected to satisfy "=sci-libs/nlopt-2.7.1-r100" has unmet requirements.
- sci-libs/nlopt-2.7.1-r100::gentoo USE="python -cxx -guile -octave -test" GUILE_SINGLE_TARGET="3-0 -2-2" 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:
    guile? ( exactly-one-of ( guile_single_target_2-2 guile_single_target_3-0 ) ) python? ( any-of ( python_targets_python3_12 ) )