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

Calculating dependencies ...

!!! Problem resolving dependencies for =media-libs/aubio-0.4.9-r4
 done!
Dependency resolution took 0.83 s (backtrack: 0/20).


!!! The ebuild selected to satisfy "=media-libs/aubio-0.4.9-r4" has unmet requirements.
- media-libs/aubio-0.4.9-r4::gentoo USE="python -blas -debug -doc -double-precision -examples -ffmpeg -fftw -jack -libsamplerate -sndfile -test" PYTHON_TARGETS="-python3_12 -python3_13"

  The following REQUIRED_USE flag constraints are unsatisfied:
    any-of ( python_targets_python3_12 python_targets_python3_13 )

  The above constraints are a subset of the following complete expression:
    any-of ( python_targets_python3_12 python_targets_python3_13 ) at-most-one-of ( double-precision libsamplerate ) doc? ( python )