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

Calculating dependencies ...

!!! Problem resolving dependencies for =media-libs/osl-1.14.5.1
 done!
Dependency resolution took 0.83 s (backtrack: 0/20).


!!! The ebuild selected to satisfy "=media-libs/osl-1.14.5.1" has unmet requirements.
- media-libs/osl-1.14.5.1::gentoo USE="clang-cuda python -debug -doc -gui -libcxx -nofma -optix -partio -test" CPU_FLAGS_X86="avx avx2 avx512f f16c sse2 sse3 sse4_1 sse4_2 ssse3" LLVM_SLOT="19 -18" PYTHON_SINGLE_TARGET="-python3_12 -python3_13"

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

  The above constraints are a subset of the following complete expression:
    exactly-one-of ( python_single_target_python3_12 python_single_target_python3_13 ) test? ( optix? ( clang-cuda ) ) exactly-one-of ( llvm_slot_18 llvm_slot_19 )