Opam 2.2.0-alpha build on Windows

[a2line]

Hi. I'm glad to try Opam 2.2.0-alpha for Windows because I hope it will simplify the build of Geneweb on that platform. After installing a fresh cygwin64 + upgrading %path, the make cold ends with:

make[1]: Entering directory '/home/Tom/opam2.2.0a'
cd src_ext/dune-local && ocaml bootstrap.ml
ocamlc -output-complete-exe -w -24 -g -o .duneboot.exe -I boot unix.cma boot/libs.ml boot/duneboot.ml
.\.duneboot.exe
/home/Tom/opam2.2.0a/src_ext/dune-local/dune.exe build --profile=release --root .  --promote-install-files -- opam-installer.install opam.install
File "src/stubs/win32/dune", line 24, characters 0-150:
24 | (rule
25 |   (targets opam-putenv.exe)
26 |   (deps    opamInject.c)
27 |   (action  (run ocaml %{dep:build-putenv.ml} %{targets} %{dep:opam-putenv.c} %{dep:cc64})))
Exception: End_of_file.
fatal: not a git repository (or any of the parent directories): .git
fatal: not a git repository (or any of the parent directories): .git
make[1]: *** [Makefile:144: build-opam] Error 1
make[1]: Leaving directory '/home/Tom/opam2.2.0a'
make: *** [Makefile:285: cold] Error 2

Full log here https://gist.github.com/a2line/a2b951b9018a402280ac244f461c8bf5

I tried make cold CONFIGURE_ARGS=--with-private-runtime for the same results. Any idea?

[rjbou]

Closing, issue moved to opam bugtracker ocaml/opam#5601