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

Calculating dependencies ... done!
Dependency resolution took 1.16 s (backtrack: 0/20).

[ebuild  N     ] dev-build/b2-5.5.3::gentoo  USE="-examples" 1198 KiB
[ebuild  N     ] dev-libs/cJSON-1.7.19::gentoo  USE="-test" 348 KiB
[ebuild  N     ] sci-libs/nanoflann-1.12.1::gentoo  USE="-examples -test" 550 KiB
[ebuild  N     ] media-libs/qhull-2020.2.8.1_alpha6:0/8.1::gentoo  USE="-doc -static-libs -test -tools" 1282 KiB
[ebuild  N     ] app-arch/lz4-1.10.0-r1:0/1.10.0-meson::gentoo  USE="-static-libs -test" 379 KiB
[ebuild  N     ] dev-libs/boost-1.91.0-r2:0/1.91.0::gentoo  USE="bzip2 context nls python stacktrace zlib -debug -doc -icu -lzma -mpi -numpy -test -test-full -tools -zstd" PYTHON_TARGETS="python3_14 -python3_12 -python3_13" 199785 KiB
[ebuild  N     ] sci-libs/flann-1.9.2_p20221027-r1::gentoo  USE="openmp -cuda -doc -examples -mpi -octave -test" 33844 KiB
[ebuild  N     ] sci-libs/pcl-1.15.1:0/1.15::gentoo  USE="opengl openmp png qhull -apps -cuda -doc -examples -openni -openni2 -pcap -qt6 -test -tutorials -usb -vtk" CPU_FLAGS_X86="avx sse" 67108 KiB

Total: 8 packages (8 new), Size of downloads: 304489 KiB