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

Calculating dependencies ... done!
Dependency resolution took 0.98 s (backtrack: 0/20).

[ebuild  N     ] app-arch/lz4-1.10.0-r1:0/1.10.0-meson::gentoo  USE="-static-libs -test" 379 KiB
[ebuild  N     ] sci-libs/flann-1.9.2_p20221027-r1::gentoo  USE="openmp -cuda -doc -examples -mpi -octave -test" 33844 KiB

Total: 2 packages (2 new), Size of downloads: 34222 KiB