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

Calculating dependencies ... done!
Dependency resolution took 0.85 s (backtrack: 1/20).


!!! All ebuilds that could satisfy "dev-util/nvidia-cuda-toolkit:=" have been masked.
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- dev-util/nvidia-cuda-toolkit-12.9.2::gentoo (masked by: NVIDIA-CUDA license(s))
- dev-util/nvidia-cuda-toolkit-11.8.0-r4::gentoo (masked by: NVIDIA-CUDA license(s))

(dependency required by "dev-libs/cutlass-4.1.0::gentoo" [ebuild])
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