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

Calculating dependencies ...

!!! Problem resolving dependencies for =dev-libs/libpy-0.2.5-r3
 done!
Dependency resolution took 0.83 s (backtrack: 0/20).


!!! The ebuild selected to satisfy "=dev-libs/libpy-0.2.5-r3" has unmet requirements.
- dev-libs/libpy-0.2.5-r3::gentoo USE="-debug -sparsehash -test" PYTHON_TARGETS="-python3_12"

  The following REQUIRED_USE flag constraints are unsatisfied:
    python_targets_python3_12

  The above constraints are a subset of the following complete expression:
    test? ( sparsehash ) any-of ( python_targets_python3_12 )