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

Calculating dependencies ... done!
Dependency resolution took 1.58 s (backtrack: 0/20).

[ebuild  N     ] dev-build/b2-5.5.3::gentoo  USE="-examples" 1198 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/xylib-1.6-r2::gentoo  USE="bzip2 zlib -gui" 363 KiB
[ebuild  NS    ] dev-lang/lua-5.1.5-r200:5.1::gentoo [5.4.8:5.4::gentoo] USE="deprecated readline" 389 KiB
[ebuild  N     ] sci-visualization/fityk-1.3.2-r1::gentoo  USE="readline -gnuplot -nlopt -wxwidgets" LUA_SINGLE_TARGET="lua5-1 -lua5-3 -lua5-4" 1575 KiB

Total: 5 packages (4 new, 1 in new slot), Size of downloads: 203306 KiB