cppo_ocamlbuild missing depends on ocamlfind

[gares]

gares@gargamel:/tmp$ opam install -y cppo_ocamlbuildThe following actions will be performed:
  - install cppo_ocamlbuild 1.6.0

=-=- Gathering sources =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
[cppo_ocamlbuild] Archive in cache

=-=- Processing actions -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
[ERROR] The compilation of cppo_ocamlbuild failed at "jbuilder build -p
        cppo_ocamlbuild -j 2".

#=== ERROR while installing cppo_ocamlbuild.1.6.0 =============================#
# opam-version 1.2.2
# os           linux
# command      jbuilder build -p cppo_ocamlbuild -j 2
# path         /tmp/xxx/4.02.3/build/cppo_ocamlbuild.1.6.0
# compiler     4.02.3
# exit-code    1
# env-file     /tmp/xxx/4.02.3/build/cppo_ocamlbuild.1.6.0/cppo_ocamlbuild-18926-1872ec.env
# stdout-file  /tmp/xxx/4.02.3/build/cppo_ocamlbuild.1.6.0/cppo_ocamlbuild-18926-1872ec.out
# stderr-file  /tmp/xxx/4.02.3/build/cppo_ocamlbuild.1.6.0/cppo_ocamlbuild-18926-1872ec.err
### stderr ###
# [...]
# 5 | (ocamlyacc (cppo_parser))
#     ^^^^^^^^^^^^^^^^^^^^^^^^^
# Warning: File cppo_parser.mli is both generated by a rule and present in the source tree.
# As a result, the rule is currently ignored, however this will become an error in the future.
# To keep the current behavior and get rid of this warning, add a field (fallback) to the rule.
# File "ocamlbuild_plugin/jbuild", line 8, characters 14-24:
# 8 |   (libraries (ocamlbuild))))
#                   ^^^^^^^^^^
# Error: Library "ocamlbuild" not found.
# Hint: try: dune external-lib-deps --missing -p cppo_ocamlbuild @install



=-=- Error report -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
The following actions failed
  - install cppo_ocamlbuild 1.6.0
No changes have been performed
gares@gargamel:/tmp$ opam install -y ocamlfind
The following actions will be performed:
  - install ocamlfind 1.8.0

=-=- Gathering sources =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
[ocamlfind] Archive in cache

=-=- Processing actions -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
-> installed ocamlfind.1.8.0
Done.
gares@gargamel:/tmp$ opam install -y cppo_ocamlbuild
The following actions will be performed:
  - install cppo_ocamlbuild 1.6.0

=-=- Gathering sources =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
[cppo_ocamlbuild] Archive in cache

=-=- Processing actions -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
-> installed cppo_ocamlbuild.1.6.0
Done.
gares@gargamel:/tmp$ 

[db4]

ocamlfind dependency is missing again in cppo_ocamlbuild 1.6.6. Can someone reopen the issue?