ocamlfind: [WARNING] Undefined toolchain: windows

[NebuPookins]

This might be related to #64 where I noticed that person also got the ocamlfind: [WARNING] Undefined toolchain: windows. Their issue eventually is resolved, but they don't exactly state what they did to fix it.

Here are some of the things I've tried:

$  opam switch
#  switch                      compiler                    description
→  ocaml-base-compiler.4.11.1  ocaml-base-compiler.4.11.1  ocaml-base-compiler.4.11.1
$  which ocamlfind
/home/nebu/.opam/ocaml-base-compiler.4.11.1/bin/ocamlfind
$ opam list
# Packages matching: installed
# Name              # Installed # Synopsis
base-bigarray       base
base-threads        base
base-unix           base
bigarray-compat     1.0.0       Compatibility library to use Stdlib.Bigarray when possible
conf-gcc-windows    1
conf-gcc-windows32  1           Virtual package specifying the location of GCC cross-compiler for 32-bit Windows
conf-libffi         2.0.0       Virtual package relying on libffi system installation
conf-pkg-config     2           Check if pkg-config is installed and create an opam switch local pkgconfig folder
conf-sdl2           1           Virtual package relying on a SDL2 system installation
ctypes              0.19.1      Combinators for binding to C libraries without writing any C
ctypes-foreign      0.18.0      Virtual package for enabling the ctypes.foreign subpackage.
dune                2.9.0       Fast, portable, and opinionated build system
flexdll-windows     0.37        FlexDLL is a Windows dynamic linker extension allowing DLLs to depend on each other
integers            0.4.0       Various signed and unsigned integer types for OCaml
ocaml               4.11.1      The OCaml compiler (virtual package)
ocaml-base-compiler 4.11.1      Official release 4.11.1
ocaml-config        1           OCaml Switch Configuration
ocamlbuild          0.14.0      OCamlbuild is a build system with builtin rules to easily build most OCaml projects.
ocamlfind           1.9.1       A library manager for OCaml
topkg               1.0.3       The transitory OCaml software packager
tsdl                0.9.8       Thin bindings to SDL for OCaml
$ ocamlfind -toolchain windows ocamlc helloworld.ml -o helloworld.byte
ocamlfind: [WARNING] Undefined toolchain: windows
$ ocamlfind list
bigarray            (version: [distributed with Ocaml])
bigarray-compat     (version: 1.0.0)
bytes               (version: [distributed with OCaml 4.02 or above])
compiler-libs       (version: [distributed with Ocaml])
compiler-libs.bytecomp (version: [distributed with Ocaml])
compiler-libs.common (version: [distributed with Ocaml])
compiler-libs.optcomp (version: [distributed with Ocaml])
compiler-libs.toplevel (version: [distributed with Ocaml])
ctypes              (version: 0.19.1)
ctypes.foreign      (version: 0.19.1)
ctypes.stubs        (version: 0.19.1)
ctypes.top          (version: 0.19.1)
dune                (version: n/a)
dune.configurator   (version: 2.9.0)
dynlink             (version: [distributed with Ocaml])
findlib             (version: 1.9.1)
findlib.dynload     (version: 1.9.1)
findlib.internal    (version: 1.9.1)
findlib.top         (version: 1.9.1)
integers            (version: n/a)
integers.top        (version: n/a)
ocamlbuild          (version: 0.14.0)
ocamldoc            (version: [distributed with Ocaml])
raw_spacetime       (version: [distributed with Ocaml])
stdlib              (version: [distributed with Ocaml])
str                 (version: [distributed with Ocaml])
threads             (version: [distributed with Ocaml])
threads.none        (version: [internal])
threads.posix       (version: [internal])
topkg               (version: 1.0.3)
tsdl                (version: v0.9.8)
tsdl.top            (version: v0.9.8)
unix                (version: [distributed with Ocaml])