'opam install ocamlfind' does not work: patch did not apply

[bruno-blanchet]

With the Installer for 64-bit OCaml 4.02.3 + OPAM:

$ opam install ocamlfind
The following actions will be performed:

• install ocamlfind 1.7.1

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

=-=- Processing actions -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=

#=== ERROR while compiling ocamlfind.1.7.1 ====================================#
These patches didn't apply at C:\cygwin64\home\bblanche.opam\system\build\ocamlfind.1.7.1:

• findlib-1.7.1.patch

=-=- Error report -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
The following actions failed

• build ocamlfind 1.7.1
  No changes have been performed

I don't really understand what happens because when I try to patch manually, it works:

$ patch -p 1 < findlib-1.7.1.patch
patching file Makefile
patching file src/findlib/findlib_config.mlp
patching file src/findlib/findlib.ml
patching file src/findlib/fl_package_base.ml
patching file src/findlib/fl_split.ml
patching file src/findlib/frontend.ml
patching file src/findlib/Makefile