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

Calculating dependencies ... done!
Dependency resolution took 1.65 s (backtrack: 0/20).

[ebuild  N     ] dev-lang/ocaml-5.4.0:0/5.4.0::gentoo  USE="ocamlopt -emacs -flambda -latex -test -xemacs" 6298 KiB
[ebuild  N     ] dev-ml/dune-3.23.1:0/3.23.1::gentoo  USE="-emacs -test" 3624 KiB
[ebuild  N     ] dev-ml/findlib-1.9.8-r1:0/1::gentoo  USE="ocamlopt -doc -tk" 269 KiB
[ebuild  N     ] dev-ml/camlp-streams-5.0.1::gentoo  USE="ocamlopt" 17 KiB
[ebuild  N     ] dev-ml/bigarray-compat-1.1.0::gentoo  USE="ocamlopt" 2 KiB
[ebuild  N     ] dev-ml/num-1.6-r1::gentoo  USE="ocamlopt" 67 KiB
[ebuild  N     ] dev-ml/result-1.5:0/1.5::gentoo  USE="ocamlopt" 3 KiB
[ebuild  N     ] dev-ml/ocamlbuild-0.16.1:0/0.16.1::gentoo  USE="ocamlopt" 198 KiB
[ebuild  N     ] dev-ml/camlp4-5.4_p1:0/5.4_p1::gentoo  USE="ocamlopt" 638 KiB
[ebuild  N     ] dev-ml/csexp-1.5.2-r1:0/1.5.2::gentoo  USE="ocamlopt -test" 12 KiB
[ebuild  N     ] dev-ml/dune-configurator-3.21.1:0/3.21.1::gentoo  USE="ocamlopt" 3352 KiB
[ebuild  N     ] dev-ml/zarith-1.14:0/1.14::gentoo  USE="ocamlopt -doc" 90 KiB
[ebuild  N     ] dev-ml/cryptokit-1.21.1:0/1.21.1::gentoo  USE="ocamlopt zlib -test" CPU_FLAGS_X86="aes" 167 KiB
[ebuild  N     ] acct-group/sks-0-r2::gentoo  0 KiB
[ebuild  N     ] acct-user/sks-0-r2::gentoo  0 KiB
[ebuild  N     ] sys-libs/db-5.3.28-r11:5.3::gentoo  USE="-cxx -doc -examples -tcl -test" 34268 KiB
[ebuild  N     ] net-misc/sks-1.1.6_p20200624-r3::gentoo  USE="-optimize -test" 209 KiB

Total: 17 packages (17 new), Size of downloads: 49207 KiB

WARNING: One or more updates/rebuilds have been skipped due to a dependency conflict:

dev-lang/ocaml:0

  (dev-lang/ocaml-5.5.1:0/5.5.1::gentoo, ebuild scheduled for merge) USE="ocamlopt -emacs -flambda -latex -test -xemacs" conflicts with
    =dev-lang/ocaml-5.4*:=[ocamlopt] required by (dev-ml/camlp4-5.4_p1:0/5.4_p1::gentoo, ebuild scheduled for merge) USE="ocamlopt"
    ^               ^^^^