Error installing ocamlfind 1.9.5 under Cygwin + opam 2.3.0~beta1 + ocaml 5.2.0

[maroneze]

In a new Windows system, I just installed Cygwin (including essential packages such as make, patch, unzip, etc), downloaded a Windows opam binary (2.3.0~beta1), did opam init and then tried to install ocamlfind (opam install ocamlfind --verbose), but I got this error:

...
λ compiled  ocamlfind.1.9.5
+ C:\OCaml64\bin\make.exe "install" (CWD=C:\Users\lsl\AppData\Local\opam\default\.opam-switch\build\ocamlfind.1.9.5)
- if [ "1" -eq 1 ]; then \
-     for x in camlp4 dbm graphics labltk num ocamlbuild; do \
-       if [ -f "C:\Users\lsl\AppData\Local\opam\default\lib/$x/META" ]; then \
-         if ! grep -Fq '[distributed with Ocaml]' "/C:\Users\lsl\AppData\Local\opam\default\lib/$x/META"; then \
-           rm -f site-lib-src/$x/META; \
-         fi; \
-       fi; \
-     done; \
-     test -f "site-lib-src/num/META" || rm -f "site-lib-src/num-top/META"; \
-   fi
- grep: /C:\Users\lsl\AppData\Local\opam\default\lib/num/META: No such file or directory
- grep: /C:\Users\lsl\AppData\Local\opam\default\lib/ocamlbuild/META: No such file or directory
- echo 'SITELIB_META =' > Makefile.packages.in
- for x in `ls site-lib-src`; do test ! -f "site-lib-src/$x/META" || echo $x >> Makefile.packages.in; done
- tr '\n' ' ' < Makefile.packages.in > Makefile.packages
- rm Makefile.packages.in
- install -d "C:\Users\lsl\AppData\Local\opam\default\bin"
- ./install: line 1: The: command not found
- ./install: line 3: syntax error near unexpected token `)'
- ./install: line 3: `1) configure the "findlib" library'
- make: *** [Makefile:21: install] Error 2

Among the existing issues, I did see mentions of issues when installing 1.9.6, or when upgrading to 1.9.6. But 1.9.5 seems to install fine for most people.

In any case, here's the full message without --verbose:

#=== ERROR while installing ocamlfind.1.9.5 ===================================#
# context     2.3.0~beta1 | win32/x86_64 | ocaml.5.2.0 | https://opam.ocaml.org#4ffa00429af77d1b2162442c6765ef9aa602be97
# path        C:\Users\lsl\AppData\Local\opam\default\.opam-switch\build\ocamlfind.1.9.5
# command     C:\OCaml64\bin\make.exe install
# exit-code   2
# env-file    C:\Users\lsl\AppData\Local\opam\log\ocamlfind-10116-74428d.env
# output-file C:\Users\lsl\AppData\Local\opam\log\ocamlfind-10116-74428d.out
### output ###
# if [ "1" -eq 1 ]; then \
# [...]
# grep: /C:\Users\lsl\AppData\Local\opam\default\lib/num/META: No such file or directory
# grep: /C:\Users\lsl\AppData\Local\opam\default\lib/ocamlbuild/META: No such file or directory
# echo 'SITELIB_META =' > Makefile.packages.in
# for x in `ls site-lib-src`; do test ! -f "site-lib-src/$x/META" || echo $x >> Makefile.packages.in; done
# tr '\n' ' ' < Makefile.packages.in > Makefile.packages
# rm Makefile.packages.in
# install -d "C:\Users\lsl\AppData\Local\opam\default\bin"
# ./install: line 1: The: command not found
# ./install: line 3: syntax error near unexpected token `)'
# ./install: line 3: `1) configure the "findlib" library'
# make: *** [Makefile:21: install] Error 2

I did note that my initial command to install opam (bash -c "sh <(curl -fsSL https://opam.ocaml.org/install.sh)") resulted in:

## Downloading opam 2.2.1 for cygwin_nt-10.0-19045 on x86_64...
There may not yet be a binary release for your architecture or OS, sorry.

So maybe my setup is simply not supported; in which case, please feel free to close this issue.

(by the way, when doing opam init, I chose "2. Use Cygwin installation found in C:\OCaml64", instead of the recommended approach, which may be relevant to the issue; and the choice of C:\OCaml64 is simply because our users got used to it, but I didn't use anything based on the old Windows installers)

[gerdstolpmann]

I think you have . in your PATH. Because of this, commands like install ... will try to run the text file INSTALL.

[tahina-pro]

Same here. This might come from dra27/mingw-w64-shims#2 (via ocaml/opam#6053)