After a long time, Esperanto was upgraded with the last version of Cosmopolitan which includes threads.cmxa now. A PR on lwt (to support Esperanto) is pending but we found an issue with dune when we tried to compile a small program. This paves the way for OCaml 5 but, in the meantime, most OCaml applications can be compiled with this new toolchain (if the C files are not too fancy). A sample application is currently available here: Bob. You can also see the reproducibility of the software here (here is an article for more information).
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