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

Calculating dependencies ... done!
Dependency resolution took 3.10 s (backtrack: 12/20).

[ebuild  N     ] dev-lang/ocaml-4.14.2:0/4.14.2::gentoo  USE="ocamlopt -emacs -flambda -latex -xemacs" 5377 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::gentoo  USE="ocamlopt -doc -tk" 269 KiB
[ebuild  N     ] dev-ml/ocamlbuild-0.16.1:0/0.16.1::gentoo  USE="ocamlopt" 198 KiB
[ebuild  N     ] dev-ml/result-1.5:0/1.5::gentoo  USE="ocamlopt" 3 KiB
[ebuild  N     ] dev-ml/stdlib-shims-0.3.0::gentoo  USE="ocamlopt" 10 KiB
[ebuild  N     ] dev-ml/re-1.14.0:0/1.14.0::gentoo  USE="ocamlopt -test" 109 KiB
[ebuild  N     ] dev-ml/ocaml-compiler-libs-0.12.4-r2:0/0.12.4::gentoo  USE="ocamlopt" 6 KiB
[ebuild  N     ] dev-ml/swhid_core-0.1::gentoo  USE="ocamlopt" 46 KiB
[ebuild  N     ] dev-ml/sexplib0-0.16.0:0/0.16.0::gentoo  USE="ocamlopt" 22 KiB
[ebuild  N     ] dev-ml/camlp-streams-5.0.1::gentoo  USE="ocamlopt" 17 KiB
[ebuild  N     ] dev-ml/ocaml-migrate-parsetree-2.4.0-r1:0/2.4.0::gentoo  USE="ocamlopt -test" 203 KiB
[ebuild  N     ] dev-ml/ppx_derivers-1.2.1:0/1.2.1::gentoo  USE="ocamlopt" 3 KiB
[ebuild  N     ] dev-ml/menhir-20250912:0/20250912::gentoo  USE="ocamlopt" 1251 KiB
[ebuild  N     ] dev-ml/patch-3.1.2:0/3.1.2::gentoo  USE="ocamlopt -test" 30 KiB
[ebuild  N     ] dev-ml/bigarray-compat-1.1.0::gentoo  USE="ocamlopt" 2 KiB
[ebuild  N     ] dev-ml/topkg-1.1.1:0/1.1.1::gentoo  USE="ocamlopt" 119 KiB
[ebuild  N     ] dev-ml/uchar-0.0.2-r1:0/0.0.2::gentoo  USE="ocamlopt" 22 KiB
[ebuild  N     ] dev-ml/ppxlib-0.30.0-r2:0/0.30.0::gentoo  USE="ocamlopt -test" 561 KiB
[ebuild  N     ] dev-ml/cppo-1.8.0:0/1.8.0::gentoo  USE="ocamlopt" 43 KiB
[ebuild  N     ] dev-ml/ocaml-sha-1.15.4:0/1.15.4::gentoo  USE="ocamlopt -test" 18 KiB
[ebuild  N     ] dev-ml/opam-file-format-2.2.0-r1:0/2.2.0::gentoo  USE="ocamlopt -test" 32 KiB
[ebuild  N     ] dev-ml/integers-0.8.0:0/0.8.0::gentoo  USE="ocamlopt" 15 KiB
[ebuild  N     ] dev-ml/mmap-1.2.0-r1:0/1.2.0::gentoo  USE="ocamlopt" 15 KiB
[ebuild  N     ] dev-ml/csexp-1.5.2-r1:0/1.5.2::gentoo  USE="ocamlopt -test" 12 KiB
[ebuild  N     ] dev-ml/cmdliner-2.1.0:0/2.1.0::gentoo  USE="ocamlopt" 96 KiB
[ebuild  N     ] dev-ml/dune-configurator-3.21.1:0/3.21.1::gentoo  USE="ocamlopt" 3352 KiB
[ebuild  N     ] dev-ml/ocplib-endian-1.2:0/1.2::gentoo  USE="ocamlopt" 18 KiB
[ebuild  N     ] dev-ml/uutf-1.0.4-r1:0/1.0.4::gentoo  USE="ocamlopt -doc" 23 KiB
[ebuild  N     ] dev-ml/base-0.16.3-r1:0/0.16::gentoo  USE="ocamlopt" 433 KiB
[ebuild  N     ] dev-ml/ocaml-ctypes-0.24.0:0/0.24.0::gentoo  USE="ocamlopt -test" 196 KiB
[ebuild  N     ] dev-ml/jsonm-1.0.2:0/1.0.2::gentoo  USE="ocamlopt" 22 KiB
[ebuild  N     ] dev-ml/ppx_here-0.16.0:0/0.16::gentoo  USE="ocamlopt" 5 KiB
[ebuild  N     ] dev-ml/ppx_let-0.16.0-r1:0/0.16::gentoo  USE="ocamlopt" 16 KiB
[ebuild  N     ] dev-ml/luv-0.5.14-r1:0/0.5.14::gentoo  USE="ocamlopt -test" 830 KiB
[ebuild  N     ] dev-libs/libev-4.33::gentoo  USE="-static-libs" 557 KiB
[ebuild  N     ] dev-ml/graphics-5.2.0-r1::gentoo  USE="ocamlopt" 65 KiB
[ebuild  N     ] dev-ml/ocamlgraph-2.2.0:0/2.2.0::gentoo  USE="ocamlopt" 311 KiB
[ebuild  N     ] dev-ml/opam-common-2.5.2:0/2.5.2::gentoo  USE="ocamlopt" 1254 KiB
[ebuild  N     ] dev-ml/opam-installer-2.5.2:0/2.5.2::gentoo  USE="ocamlopt" 0 KiB
[ebuild  N     ] dev-ml/astring-0.8.5:0/0.8.5::gentoo  37 KiB
[ebuild  N     ] dev-ml/fmt-0.11.0:0/0.11.0::gentoo  USE="ocamlopt -test" 23 KiB
[ebuild  N     ] dev-ml/react-1.2.2-r1:0/1.2.2::gentoo  USE="-test" 40 KiB
[ebuild  N     ] dev-ml/ptime-1.2.0:0/1.2.0::gentoo  USE="ocamlopt" 31 KiB
[ebuild  N     ] dev-ml/fpath-0.7.3:0/0.7.3::gentoo  24 KiB
[ebuild  N     ] dev-ml/ocaml-crunch-4.0.0::gentoo  USE="ocamlopt" 60 KiB
[ebuild  N     ] dev-ml/lwt-5.9.1-r1:0/5.9.1::gentoo  USE="ocamlopt -test" 305 KiB
[ebuild  N     ] dev-ml/markup-1.0.3:0/1.0.3::gentoo  USE="ocamlopt -test" 275 KiB
[ebuild  N     ] dev-ml/tyxml-4.6.0_p20260130::gentoo  USE="ocamlopt -test" 127 KiB
[ebuild  N     ] dev-ml/odoc-2.4.3-r1::gentoo  USE="ocamlopt -test" 1723 KiB

Total: 50 packages (50 new), Size of downloads: 21808 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-5.3 required by (dev-ml/odoc-2.4.3-r1:0/0::gentoo, ebuild scheduled for merge) USE="ocamlopt -test"
    ^               ^^^

dev-ml/ppxlib:0

  (dev-ml/ppxlib-0.39.0:0/0.39.0::gentoo, ebuild scheduled for merge) USE="ocamlopt -test" conflicts with
    <dev-ml/ppxlib-0.36.0 required by (dev-ml/ppx_let-0.16.0-r1:0/0.16::gentoo, ebuild scheduled for merge) USE="ocamlopt"
    ^              ^^^^^^

dev-ml/sexplib0:0

  (dev-ml/sexplib0-0.17.0-r2:0/0.17::gentoo, ebuild scheduled for merge) USE="ocamlopt" conflicts with
    =dev-ml/sexplib0-0.16*:=[ocamlopt] required by (dev-ml/base-0.16.3-r1:0/0.16::gentoo, ebuild scheduled for merge) USE="ocamlopt"
    ^                ^^^^^            


!!! The following update(s) have been skipped due to unsatisfied dependencies
!!! triggered by backtracking:

dev-ml/findlib:0
dev-ml/ocaml-compiler-libs:0
dev-ml/ppx_let:0
dev-ml/lwt:0