1) utop session with failed ctypes, in cmd.exe terminal.txt

C:\cygwin64\home\Mateusz\.opam\system\bin>set PATH=%PATH%;c:\cygwin64\home\Mateusz\.opam\system\lib\stublibs

C:\cygwin64\home\Mateusz\.opam\system\bin>utop
────────────────────────────┬──────────────────────────────────────────────────────────────┬────────────────────────────
                            │ Welcome to utop version 1.19.3 (using OCaml version 4.02.3)! │
                            └──────────────────────────────────────────────────────────────┘

Type #utop_help for help about using utop.

─( 00:51:04 )─< command 0 >──────────────────────────────────────────────────────────────────────────────{ counter: 0 }─
utop # #use "topfind";;
Cannot find file topfind.
─( 00:51:04 )─< command 1 >──────────────────────────────────────────────────────────────────────────────{ counter: 0 }─
utop # Topdirs.dir_directory "/cygwin64/home/Mateusz/.opam/system/lib/toplevel"
;;
- : unit = ()
─( 00:51:12 )─< command 2 >──────────────────────────────────────────────────────────────────────────────{ counter: 0 }─
utop # #use "topfind";;
- : unit = ()
Findlib has been successfully loaded. Additional directives:
  #require "package";;      to load a package
  #list;;                   to list the available packages
  #camlp4o;;                to load camlp4 (standard syntax)
  #camlp4r;;                to load camlp4 (revised syntax)
  #predicates "p,q,...";;   to set these predicates
  Topfind.reset();;         to force that packages will be reloaded
  #thread;;                 to enable threads

- : unit = ()
─( 00:58:22 )─< command 3 >──────────────────────────────────────────────────────────────────────────────{ counter: 0 }─
utop # #require "ctypes.foreign";;
Cannot load required shared library dllctypes-foreign-base_stubs.
Reason: dllctypes-foreign-base_stubs.dll: Operacja ukończona pomyślnie.
.
Error: Reference to undefined global `Ctypes_closure_properties'
─( 00:58:30 )─< command 4 >──────────────────────────────────────────────────────────────────────────────{ counter: 0 }─
utop # #require "ctypes";;
─( 01:01:45 )─< command 5 >──────────────────────────────────────────────────────────────────────────────{ counter: 0 }─
utop # #require "ctypes.foreign";;
Error: Reference to undefined global `Ctypes_closure_properties'

2) session in rlwrap ocaml, in Cygwin terminal.txt

$ PATH=$PATH:/home/Mateusz/.opam/system/lib/stublibs/ rlwrap ocaml
        OCaml version 4.02.3

# #use "topfind";;
Cannot find file topfind.
# Topdirs.dir_directory "/cygwin64/home/Mateusz/.opam/system/lib/toplevel";;
- : unit = ()
# #use "topfind";;
- : unit = ()
Findlib has been successfully loaded. Additional directives:
  #require "package";;      to load a package
  #list;;                   to list the available packages
  #camlp4o;;                to load camlp4 (standard syntax)
  #camlp4r;;                to load camlp4 (revised syntax)
  #predicates "p,q,...";;   to set these predicates
  Topfind.reset();;         to force that packages will be reloaded
  #thread;;                 to enable threads

- : unit = ()
# #require "ctypes.foreign";;
C:\OCaml\lib\unix.cma: loaded
C:\OCaml\lib\bigarray.cma: loaded
C:\OCaml\lib\str.cma: loaded
C:\cygwin64\home\Mateusz\.opam\system\lib\bytes: added to search path
C:\cygwin64\home\Mateusz\.opam\system\lib\ctypes: added to search path
C:\cygwin64\home\Mateusz\.opam\system\lib\ctypes\ctypes.cma: loaded
C:\cygwin64\home\Mateusz\.opam\system\lib\ctypes\ctypes-foreign-base.cma: loaded
Cannot load required shared library dllctypes-foreign-base_stubs.
Reason: dllctypes-foreign-base_stubs.dll: Cannot resolve ffi_type_pointer.
C:\cygwin64\home\Mateusz\.opam\system\lib\ctypes\ctypes-foreign-unthreaded.cma: loaded
Characters -1--1:
  #require "ctypes.foreign";;

Error: Reference to undefined global `Ctypes_closure_properties'
#