Jan Midtgaard

> Does anyone understand what went wrong on the cygwin build? Looking at the CI logs: ``` Processing actions -> retrieved ctypes-foreign.0.24.0 (cached) -> retrieved mingw-w64-shims.0.2.0 (cached) -> removed mingw-w64-shims.0.2.0...

To help understand what's going wrong you can - rerun the GH action with debug logging https://github.blog/changelog/2022-05-24-github-actions-re-run-jobs-with-debug-logging/ - another option is to add a `flags: verbose` field to the package...

> Okay, I reproduced it by uninstalling the Opam packages `ctypes-foreign`, `conf-libffi`, and `conf-mingw-w64-x86_64-libffi`. I also uninstalled the Cygwin packages `mingw64-x86_64-libffi` and `mingw64-i686-libffi`. > > I then reinstalled `ctypes-foreign`. That...

> > I'm wondering whether that may play a part in the above, meaning that the Cygwin `libffi` packages are picked up instead of the MinGW ones. > > Maybe....

> What I can confirm is that it is looking for libffi-6.dll at runtime. I don't think libffi-8 matters. OK, that's one thing to rule out at least! I'm still...

Thanks! :pray: What is the output of `opam var --global` on the Windows machine? If `os-distribution` isn't `"cygwin"` (or `"msys2"`) that could explain why none of the side-conditions are triggered......

That does look normal indeed. My last suggestion to explain the difference between CI and your machine would be the opam version. Do you experience the same behaviour with, e.g.,...

Indeed this can appear a bit verbose to a newcomer! 😅 It does look to me like it succeeded nevertheless 👍 If you click `a more detailed explanation of the...

I've now opened https://github.com/ocaml/opam-repository/pull/28986 with my last suggestion to help unblock this PR.

Nice! Should we also add the upper bound to `efl.1.12.0` to `efl.1.22.0` while we are at it, as the previous versions on the opam repo seem to have the same...