I would gladly test your patch but I do not how to do it. From documentation, I would infer that I need a magic invocation close to opam pin add opam-devel --dev but I suspect this one only upgrade to the trunk version.

Could you give me the spell please?

Thank you

cd /tmp && git clone -b fix-3 git://github.com/kit-ty-kate/opam.git && cd opam && make cold

The binary is then available as ./opam (which is a symlink to _build/default/src/client/opamMain.exe)
This won't require you to install any dependencies or do anything with the opam already installed.

Ouch, after a long compilation time I get an error:

File "_none_", line 1:   
Error: The external function `unix_spawn' is not available
make[1]: *** [build-opam] Error 1
make: *** [cold] Error 2

(oops i forgot to get my branch in the command above, I've updated it)

uh, that a weird one :/ I'm not able to produce this on an macOS/arm64. Could you give a bit more of log? (the full one would be good, but at least the last command to see where we are)

I had already changed the git repo...

log.txt

Ah I see the issue. I was able to reproduce locally, thanks for your help. It's an issue with the cold target when you also have bits of older compiler (in this case your 4.10.1 switch).

You can take it back from where you left it with:

env PATH="$(pwd)/bootstrap/ocaml/bin:$PATH" CAML_LD_LIBRARY_PATH= make

Hello,

Sorry for the week end break. The compilation finished gracefully using your command. The compiled opam does not ask to install xquartz. So it seems to be solved.

Thank you

Thanks!