[Bug 259888] devel/ocaml-opam ; opam install error

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=259888

--- Comment #1 from Hannes Mehnert <hannes@mehnert.org> ---
Dear Alain,

first of all: this is not an issue with devel/ocaml-opam - which compiles fine,
but the output (opam - the OCaml package manager) fails to install some
packages due to the OCaml port (lang/ocaml) being very old (see
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=250408 for an attempt to
update it).

This is a known issue in OCaml 4.08 (e.g.
https://github.com/ocaml/ocaml/issues/9540). Since `opam` installed
successfully, you can create a "switch" with a more up-to-date OCaml compiler:
$ opam switch create 4.13.1
[... bootstraps and compiles an OCaml compiler, takes some time (10 minutes)
...]
$ eval $(opam env)
[ now your current shell has some environment variables that will use that
switch - run the eval $(opem env) in each shell or via ~/.profile to get this
newer OCaml compiler ]
$ opam install async yojson core_extended core_bench cohttp-async
async_graphics cryptokit menhir base core
[ should work now ]

The root cause is: lang/ocaml is very old and should be updated. In the
meantime, opam offers you to install another (newer) OCaml compiler locally.

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