Bug? help2man: can't get `--help' info from ../src/idn2 Try `--no-discard-stderr' if option outputs to stderr

Help
1

Hello experts,
I am trying to compile the project on mac x86-64 for mac aarch64 and getting the error:

make[2]: Entering directory '/private/tmp/nix-build-libidn2-aarch64-apple-darwin-2.3.4.drv-0/libidn2-2.3.4/doc'
/nix/store/7kc331g8kcpbrkaqyx7rnqd1mnkk08fm-bash-5.2-p15/bin/bash '/private/tmp/nix-build-libidn2-aarch64-apple-darwin-2.3.4.drv-0/libidn2-2.3.4/build-aux/missing' help2man --include=./idn2.h2m \
        --output=idn2.1 ../src/idn2
help2man: can't get `--help' info from ../src/idn2
Try `--no-discard-stderr' if option outputs to stderr
make[2]: *** [Makefile:2277: idn2.1] Error 126
make[2]: Leaving directory '/private/tmp/nix-build-libidn2-aarch64-apple-darwin-2.3.4.drv-0/libidn2-2.3.4/doc'
make[1]: *** [Makefile:1657: all-recursive] Error 1
make[1]: Leaving directory '/private/tmp/nix-build-libidn2-aarch64-apple-darwin-2.3.4.drv-0/libidn2-2.3.4'
make: *** [Makefile:1565: all] Error 2

I have included help2man and also libidn2.dev.
I am not sure that the script is fine, but the one with the same logic works fine when compiling to aarch64 on x86-64 linux.


let
  nixpkgs = fetchTarball "https://github.com/nixOS/nixpkgs/archive/23.05.tar.gz";
  pkgs = (import nixpkgs {}).pkgsCross.aarch64-darwin;
in
pkgs.callPackage (
    { mkShell, cmake, ninja, git, pkg-config, help2man, automake }:
  pkgs.llvmPackages_14.stdenv.mkDerivation {

  pname = "prj";
  version = "dev-bin";

  src = ./.;

  nativeBuildInputs = with pkgs;
    [ cmake ninja git pkg-config help2man automake ];

  buildInputs = with pkgs;
   lib.forEach [
       secp256k1 libsodium.dev libmicrohttpd.dev gmp.dev nettle.dev
          libtasn1.dev
          libidn2.dev
       libunistring.dev gettext (gnutls.override { withP11-kit = false; }).dev
      ]
      (x: x.overrideAttrs(oldAttrs: rec { configureFlags = (oldAttrs.configureFlags or []) ++ [ "--enable-static" "--disable-shared" "--disable-tests" ]; dontDisableStatic = true; }))
    ++ [
      darwin.apple_sdk.frameworks.CoreFoundation
      (openssl.override { static = true; }).dev
      (zlib.override { shared = false; }).dev
      (libiconv.override { enableStatic = true; enableShared = false; })
   ];


  dontAddStaticConfigureFlags = true;
  makeStatic = true;

  configureFlags = [];

  LDFLAGS = [
    "-static-libstdc++"
    "-framework CoreFoundation"
  ];

  postInstall = ''
     moveToOutput bin "$bin"
  '';

  outputs = [ "bin" "out" ];
}

) {}

Appreciate any advice on how to proceed. Thank you.