voodoo-lib fails to build on OCaml 4.02

[tmcgilchrist]

[ERROR] The compilation of voodoo-lib failed at "/home/opam/.opam/4.02/bin/dune build -p voodoo-lib -j 71 @install".

#=== ERROR while compiling voodoo-lib.~dev ====================================#
# context              2.0.10 | linux/x86_64 | ocaml-base-compiler.4.02.3 | pinned(git+https://github.com/ocaml-doc/voodoo.git#67ccabec49b5f4d24147839291fcae7c19d3e8c9#67ccabec)
# path                 ~/.opam/4.02/.opam-switch/build/voodoo-lib.~dev
# command              ~/.opam/4.02/bin/dune build -p voodoo-lib -j 71 @install
# exit-code            1
# env-file             ~/.opam/log/voodoo-lib-1-a5e08f.env
# output-file          ~/.opam/log/voodoo-lib-1-a5e08f.out
### output ###
# (cd _build/default && /home/opam/.opam/4.02/bin/ocamlc.opt -w -40 -g -bin-annot -I src/voodoo/.voodoo_lib.objs/byte -I /home/opam/.opam/4.02/lib/astring -I /home/opam/.opam/4.02/lib/bos -I /home/opam/.opam/4.02/lib/bytes -I /home/opam/.opam/4.02/lib/fmt -I /home/opam/.opam/4.02/lib/fpath -I /home/opam/.opam/4.02/lib/logs -I /home/opam/.opam/4.02/lib/result -I /home/opam/.opam/4.02/lib/rresult -I /home/opam/.opam/4.02/lib/seq -I /home/opam/.opam/4.02/lib/sexplib -I /home/opam/.opam/4.02/lib/uchar -I /home/opam/.opam/4.02/lib/yojson -I src/voodoo/serialize/.voodoo_serialize.objs/byte -intf-suffix .ml -no-alias-deps -open Voodoo_lib -o src/voodoo/.voodoo_lib.objs/byte/voodoo_lib__Opam.cmo -c -impl src/voodoo/opam.ml)
# File "src/voodoo/opam.ml", line 10, characters 36-38:
# Error: Unbound constructor Ok
# (cd _build/default && /home/opam/.opam/4.02/bin/ocamlopt.opt -w -40 -g -I src/voodoo/.voodoo_lib.objs/byte -I src/voodoo/.voodoo_lib.objs/native -I /home/opam/.opam/4.02/lib/astring -I /home/opam/.opam/4.02/lib/bos -I /home/opam/.opam/4.02/lib/bytes -I /home/opam/.opam/4.02/lib/fmt -I /home/opam/.opam/4.02/lib/fpath -I /home/opam/.opam/4.02/lib/logs -I /home/opam/.opam/4.02/lib/result -I /home/opam/.opam/4.02/lib/rresult -I /home/opam/.opam/4.02/lib/seq -I /home/opam/.opam/4.02/lib/sexplib -I /home/opam/.opam/4.02/lib/uchar -I /home/opam/.opam/4.02/lib/yojson -I src/voodoo/serialize/.voodoo_serialize.objs/byte -I src/voodoo/serialize/.voodoo_serialize.objs/native -intf-suffix .ml -no-alias-deps -open Voodoo_lib -o src/voodoo/.voodoo_lib.objs/native/voodoo_lib__Opam.cmx -c -impl src/voodoo/opam.ml)
# File "src/voodoo/opam.ml", line 10, characters 36-38:
# Error: Unbound constructor Ok

See https://docs.ci.ocaml.org/job/2023-10-17/003519-voodoo-do-70bfd9