can't install from opam with cygwin

[Et7f3]

Hello,

I'm Cygwin user on Windows 10. I have installed all dependencies (you can see dbm, lwt_ssl, and so on are already installed by opam)
I have this eror message. So I decide to clean and retry and get the same erorr

root@Windows10 ~
$ opam clean
Cleaning up switch ocaml-base-compiler
Clearing cache of downloaded files
Clearing logs

root@Windows10 ~
$ eval $(opam env)

root@Windows10 ~
$ opam install ocsigen-start
The following actions will be performed:
  ∗ install eliom           6.7.0 [required by ocsigen-start]
  ∗ install ocsigen-toolkit 2.1.0 [required by ocsigen-start]
  ∗ install ocsigen-start   1.5.0
===== ∗ 3 =====
Do you want to continue? [Y/n] Y

<><> Gathering sources ><><><><><><><><><><><><><><><><><><><><><><><><><><><><>
[ocsigen-toolkit.2.1.0] downloaded from cache at https://opam.ocaml.org/cache
[eliom.6.7.0] downloaded from cache at https://opam.ocaml.org/cache
[ocsigen-start.1.5.0] downloaded from cache at https://opam.ocaml.org/cache

<><> Processing actions <><><><><><><><><><><><><><><><><><><><><><><><><><><><>
[ERROR] The compilation of eliom failed at "/usr/bin/make".

#=== ERROR while compiling eliom.6.7.0 ========================================#
# context     2.0.3 | cygwin/x86_32 | ocaml-base-compiler.4.07.1 | https://opam.ocaml.org#2e1f5d7c
# path        ~/.opam/ocaml-base-compiler/.opam-switch/build/eliom.6.7.0
# command     /usr/bin/make
# exit-code   2
# env-file    ~/.opam/log/eliom-13183-0c525f.env
# output-file ~/.opam/log/eliom-13183-0c525f.out
### output ###
# [...]
# ocamlfind ocamlc -c -g -keep-locs -package unix,findlib -w +A-4-6-7-9-27-37-40-42-44-48 -I src/tools -o src/tools/eliompp_lexer.cmo src/tools/eliompp_lexer.ml
# ocamlfind ocamlc -c -g -keep-locs -package unix,findlib -w +A-4-6-7-9-27-37-40-42-44-48 -I src/tools -o src/tools/eliompp.cmo src/tools/eliompp.ml
# ocamlfind ocamlopt -c -g -keep-locs -package unix,findlib -w +A-4-6-7-9-27-37-40-42-44-48 -I src/tools -o src/tools/eliompp_lexer.cmx src/tools/eliompp_lexer.ml
# ocamlfind ocamlopt -c -g -keep-locs -package unix,findlib -w +A-4-6-7-9-27-37-40-42-44-48 -I src/tools -o src/tools/eliompp.cmx src/tools/eliompp.ml
# ocamlfind ocamlopt -linkpkg -g -keep-locs -package unix,str,findlib -I src/tools src/tools/eliompp_lexer.cmx src/tools/eliompp.cmx -o src/tools/eliompp.native
# ln -f src/tools/eliomc.native src/tools/js_of_eliom.native
# ocamlfind ocamldep -package js_of_ocaml-ppx.deriving -package react,js_of_ocaml,reactiveData -package lwt_react,tyxml.functor,js_of_ocaml.tyxml,js_of_ocaml-lwt,js_of_ocaml-lwt.logger -package deriving.runtime,js_of_ocaml.deriving -package ocsigenserver.cookies,ocsigenserver.polytables,ocsigenserver.baselib.base -modules src/lib/client/eliom_bus.mli > src/lib/client/eliom_bus.mli.depends
# + ocamlfind ocamldep -package js_of_ocaml-ppx.deriving -package react,js_of_ocaml,reactiveData -package lwt_react,tyxml.functor,js_of_ocaml.tyxml,js_of_ocaml-lwt,js_of_ocaml-lwt.logger -package deriving.runtime,js_of_ocaml.deriving -package ocsigenserver.cookies,ocsigenserver.polytables,ocsigenserver.baselib.base -modules src/lib/client/eliom_bus.mli > src/lib/client/eliom_bus.mli.depends
# File "_none_", line 1:
# Error: Cannot load js_of_ocaml-ppx_deriving_json: error loading shared library: Permission denied
# Command exited with code 2.
# make: *** [Makefile:7: all] Error 10



<><> Error report <><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><>
┌─ The following actions failed
│ λ build eliom 6.7.0
└─
╶─ No changes have been performed
root@Windows10 ~
$ opam --version
2.0.3
root@Windows10 ~
$ opam switch
#  switch               compiler                    description
   default              ocaml-system.4.04.2         default
→  ocaml-base-compiler  ocaml-base-compiler.4.07.1  ocaml-base-compiler

I gave you the version of opam. My Cygwin package are all up to date.
I have cygwin 32 bits (because 64bits can't buil dune), windows 64 bits.

[Et7f3]

I have tested like the README
make produce the same error
make install produce this eror
make: *** No rule to make target 'eliom.install', needed by 'install'. Stop.

[Et7f3]

I have tested form cygwin terminal or cmd
and the same bug happen so I show cmd syntax but is easy to convert to bash syntax or whatever (* ask me if you you *)

step to reproduce:

1. Install cygwin 32 bits

2. Install dependencies
   set root="X:\cygwin32" setup-x86.exe --site http://cygwin.mirror.constant.com --quiet-mode --root %root% --arch x86 --disable-buggy-antivirus --local-package-dir %root% --prune-install --packages opam,libgmp-devel,libssl-devel,libgdbm-devel,libpcre-devel,zlib-devel,libgtk2.0-devel,xinit

3. init opam with ocaml-base-compiler switch (* the default can't build dune so it can't build eliom *)
   %root%\bin\opam.exe init -n --compiler=ocaml-base-compiler --switch=ocaml-base-compiler

4. clone this repo
   %root%\bin\git clone https://github.com/ocsigen/eliom.git

5. set some environment variable (like path) or switch to cygwin terminal (mintty will do that for you)
   dont forget to eval $(opam env)

6. cd eliom

7. make -n
   ocamlbuild -no-plugin -I src/ocamlbuild -no-links -use-ocamlfind build/build.native 1> /dev/null ocaml pkg/build.ml manpage=false native=true native-dynlink=true

8. execute first line
   Ocamlbuild exit with 0 status code and doesn't print anything.

9. execute last line
   it exit with status code 10. The last command that fail

File "src/tools/distillery.ml", line 300, characters 16-32:
Warning 3: deprecated: Stdlib.String.lowercase
Use String.lowercase_ascii instead.
+ ocamlfind ocamldep -package js_of_ocaml-ppx.deriving -package react,js_of_ocaml,reactiveData -package lwt_react,tyxml.functor,js_of_ocaml.tyxml,js_of_ocaml-lwt,js_of_ocaml-lwt.logger -package deriving.runtime,js_of_ocaml.deriving -package ocsigenserver.cookies,ocsigenserver.polytables,ocsigenserver.baselib.base -modules src/lib/client/eliom_bus.mli > src/lib/client/eliom_bus.mli.depends
File "_none_", line 1:
Error: Cannot load js_of_ocaml-ppx_deriving_json: error loading shared library: Permission denied
Command exited with code 2.
Compilation unsuccessful after building 67 targets (4 cached) in 00:01:38.