# esy-build-package: running: "jbuilder" "build" "-p" "lwt" "-j" "4"
      ocamlc src/unix/.lwt_unix.objs/lwt_fmt.{cmi,cmti}
File "src/unix/lwt_fmt.mli", line 42, characters 23-69:
Warning 50: ambiguous documentation comment
    discover src/unix/lwt_config.{h,ml},src/unix/unix_c_flags.sexp,src/unix/unix_c_library_flags.sexp (exit 1)
(cd _build/default/src/unix && config/discover.exe -ocamlc-config ocamlc_config -lwt-config lwt_config)
found config var ext_obj: ...................... .o
found config var default_executable_name: ...... camlprog.exe
found config var ccomp_type: ................... cc
found config var system: ....................... mingw64
found config var os_type: ...................... Win32
found config var use_libev: .................... false
not checking for pkg-config
Error: failed to compile a trivial ocaml toplevel.
You may be missing core components (compiler, ncurses, etc)