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

Calculating dependencies ...

!!! Problem resolving dependencies for =media-libs/openimageio-2.5.19.0
 done!
Dependency resolution took 0.82 s (backtrack: 0/20).


!!! The ebuild selected to satisfy "=media-libs/openimageio-2.5.19.0" has unmet requirements.
- media-libs/openimageio-2.5.19.0::gentoo USE="gif jpeg2k python tools truetype -dicom -doc -ffmpeg -fits -gui -opencv -openvdb -ptex -raw -test" CPU_FLAGS_X86="aes avx avx2 avx512f f16c sse2 sse3 sse4_1 sse4_2 ssse3" PYTHON_SINGLE_TARGET="-python3_12 -python3_13"

  The following REQUIRED_USE flag constraints are unsatisfied:
    python? ( exactly-one-of ( python_single_target_python3_12 python_single_target_python3_13 ) )

  The above constraints are a subset of the following complete expression:
    python? ( exactly-one-of ( python_single_target_python3_12 python_single_target_python3_13 ) ) gui? ( tools ) test? ( tools truetype )