WindowsにOCaml入れようとしてocamlfindが動かない件

おはようございます。長男、次男とも無事に念願のトランスフォーマースピードチェンジシリーズのお目当てのキャラを手に入れました。kjunichiです。

公式のガイドに従ってやってるつもり。

しかし、

opam install depext-cygwinports

The following actions will be performed:
  - install config-file        1.2                              [required by depext-cygwinports]
  - install depext-cygwinports 0.0.6
===== 2 to install =====
Do you want to continue ? [Y/n]

=-=- Gathering sources =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=

=-=- Processing actions -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
[config-file: ./configure C:\tools\cygwin\home\kjw_j\.opam\system] Command started
[config-file: make all] Command started
[ERROR] The compilation of config-file failed at "make all".
[config-file: ocamlfind remove] Command started

#=== ERROR while compiling config-file.1.2 ====================================#
# opam-version         1.3.0~dev2 (d4f7e01216dbb44af4e7cc6539a1b0afa9be9d2c)
# os                   win32
# command              bash -c make all
# path                 C:\tools\cygwin\home\kjw_j\.opam\system\build\config-file.1.2
# exit-code            2
# env-file             C:\tools\cygwin\home\kjw_j\.opam\system\build\config-file.1.2\config-file-4352-1872ec.env
# stdout-file          C:\tools\cygwin\home\kjw_j\.opam\system\build\config-file.1.2\config-file-4352-1872ec.out
# stderr-file          C:\tools\cygwin\home\kjw_j\.opam\system\build\config-file.1.2\config-file-4352-1872ec.err
### stdout ###
# /home/kjw_j/.opam/system/bin/ocamlfind ocamlc   -c config_file.mli
### stderr ###
# ocamlfind: C:OCamlib\ld.conf: No such file or directory
# make: *** [master.Makefile:45: config_file.cmi] エラー 2



=-=- Error report -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
The following actions were aborted
  - install depext-cygwinports 0.0.6
The following actions failed
  - build config-file 1.2
No changes have been performed