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

Calculating dependencies ... done!
Dependency resolution took 1.07 s (backtrack: 0/20).

[ebuild  N     ] dev-build/b2-5.5.3::gentoo  USE="-examples" 1198 KiB
[ebuild  N     ] dev-cpp/catch-3.15.3::gentoo  USE="-test" 1181 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     ] dev-libs/libmcfp-1.4.2::gentoo  USE="-test" 35 KiB
[ebuild  N     ] sci-libs/libcifpp-10.0.4::gentoo  USE="sqlite -examples -test" 74476 KiB
[ebuild  N     ] sci-chemistry/dssp-4.6.1-r1::gentoo  USE="-test" 243 KiB

Total: 6 packages (6 new), Size of downloads: 276914 KiB