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

Calculating dependencies ... done!
Dependency resolution took 1.79 s (backtrack: 6/20).

[ebuild  N     ] dev-lang/ocaml-5.3.0-r1:0/5.3.0::gentoo  USE="ocamlopt -emacs -flambda -latex -test -xemacs" 6094 KiB
[ebuild  N     ] dev-libs/libpcre-8.45-r4:3::gentoo  USE="bzip2 cxx jit pcre16 readline (unicode) zlib -libedit -pcre32 -static-libs -valgrind" 1542 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/sexplib0-0.17.0-r2:0/0.17::gentoo  USE="ocamlopt" 23 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/menhir-20250912:0/20250912::gentoo  USE="ocamlopt" 1251 KiB
[ebuild  N     ] dev-ml/ocaml_intrinsics_kernel-0.17.0:0/0.17::gentoo  USE="ocamlopt" 12 KiB
[ebuild  N     ] dev-ml/camlp-streams-5.0.1::gentoo  USE="ocamlopt" 17 KiB
[ebuild  N     ] dev-ml/num-1.6-r1::gentoo  USE="ocamlopt" 67 KiB
[ebuild  N     ] dev-ml/camlp4-5.3_p1:0/5.3_p1::gentoo  USE="ocamlopt" 639 KiB
[ebuild  N     ] dev-ml/csexp-1.5.2-r1:0/1.5.2::gentoo  USE="ocamlopt -test" 12 KiB
[ebuild  N     ] dev-ml/uchar-0.0.2-r1:0/0.0.2::gentoo  USE="ocamlopt" 22 KiB
[ebuild  N     ] dev-ml/parsexp-0.17.0:0/0.17::gentoo  USE="ocamlopt" 58 KiB
[ebuild  N     ] dev-ml/dune-configurator-3.21.1:0/3.21.1::gentoo  USE="ocamlopt" 3352 KiB
[ebuild  N     ] dev-ml/sexplib-0.17.0-r1:0/0.17::gentoo  USE="ocamlopt" 55 KiB
[ebuild  N     ] dev-ml/stdcompat-21.1-r1:0/21.1::gentoo  611 KiB
[ebuild  N     ] dev-ml/parmap-1.2.5:0/1.2.5::gentoo  USE="ocamlopt" 48 KiB
[ebuild  N     ] dev-ml/base-0.17.3:0/0.17.3::gentoo  USE="ocamlopt" 468 KiB
[ebuild  N     ] dev-ml/stdio-0.17.0-r2:0/0.17::gentoo  USE="ocamlopt" 8 KiB
[ebuild  N     ] dev-ml/pcre-ocaml-7.5.0:0/7.5.0::gentoo  USE="ocamlopt -examples" 41 KiB
[ebuild  N     ] dev-util/coccinelle-1.3.1::gentoo  USE="ocamlopt pcre python -doc -emacs -test" PYTHON_SINGLE_TARGET="python3_14 -python3_12 -python3_13" 2251 KiB

Total: 23 packages (23 new), Size of downloads: 20653 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 required by (dev-ml/stdcompat-21.1-r1:0/21.1::gentoo, ebuild scheduled for merge) USE=""
    ^               ^^^


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

dev-ml/camlp4:0