reason-sdl2.nix => SOLVED => BUILDING FINE

reason-sdl2.nix

{ buildDunePackage, cacert, dune-configurator, fetchFromGitHub, fetchurl, gnused, lib, libGL, libGLU, python3Packages, reason, revery-ui, SDL2, stdenv, writeShellScript, xorg }:

let libglad =
  stdenv.mkDerivation {
    name = "glad-output-generator-c";

    outputHashMode = "recursive";
    outputHashAlgo = "sha256";
    outputHash = "sha256-5NhLnlqTlN8f5Jplv9ZIKzYdCJe5EVzHL4pr3MLctQE=";

    builder = writeShellScript "builder.sh" ''
      ${python3Packages.glad}/bin/glad --generator c --out-path $out

      # Remove line #3 that has moving date.
      ${gnused}/bin/sed -i '3s/.*//' $out/include/glad/glad.h
      ${gnused}/bin/sed -i '3s/.*//' $out/src/glad.c
    '';
    SSL_CERT_FILE = "${cacert.out}/etc/ssl/certs/ca-bundle.crt";
  };
  stb_image = fetchurl {
    url = "https://raw.githubusercontent.com/nothings/stb/5ba0baaa269b3fd681828e0e3b3ac0f1472eaf40/stb_image.h";
    sha256 = "sha256-kfQ14PxqYgAYuHi5hZx03/YNKARvh+ZJGRrW81qYxyI=";
  };
in

buildDunePackage rec {
  pname = "reason-sdl2";

  inherit (revery-ui) version src;

  postPatch = ''
    SOURCE_ROOT=$(mktemp -d)
    cd $SOURCE_ROOT
    export cur__root="."

    cp -r ${src}/packages/reason-sdl2/src/* .
    cp ${src}/reason-sdl2.opam .
    cp ${stb_image.out} stb_image.h

    substituteInPlace sdl2_wrapper.cpp \
      --replace "case SDL_PANEVENT:" \
                "/* case SDL_PANEVENT:" \
      --replace "case SDL_DROPTEXT:" \
                "*/ case SDL_DROPTEXT:"

    substituteInPlace sdl2_wrapper.cpp \
      --replace "case SDL_WINDOWEVENT_FULLSCREEN:" \
                "/* case SDL_WINDOWEVENT_FULLSCREEN:" \
      --replace "case SDL_WINDOWEVENT_RESTORED:" \
                "*/ case SDL_WINDOWEVENT_RESTORED:"
  '';

  SDL2_LIB_PATH=''${(SDL2.override { withStatic = true; }).out}/lib'';
  SDL2_INCLUDE_PATH="${SDL2.dev}/include/SDL2";
  #ANGLE_LIB_PATH=""; # This environment variable likely shouldn't be empty.

  nativeBuildInputs = [
    reason
  ];

  buildInputs = [
    dune-configurator
    libGL
    libglad
    libGLU
    SDL2.dev
    (SDL2.override { withStatic = true; }).out
  ] ++ (with xorg; [
    libpthreadstubs
    libXcursor
    libXi
    libXinerama
    libXrandr
    libXxf86vm
  ]);

  # ccopt(libFilePath) # Library to be found yet.

  meta = with lib; {
    description = "Ocaml/Reason bindings for SDL2";
    homepage = "https://github.com/revery-ui/reason-sdl2";
    downloadpage = "https://github.com/revery-ui/revery/tree/master/packages/reason-sdl2/src";
    maintainers = with maintainers; [ superherointj ];
    license = licenses.mit;
  };
}

Error seems to come from:
https://github.com/revery-ui/revery/blob/master/packages/reason-sdl2/src/config/discover.re

Found solution:

SDL2_LIB_PATH=''${(SDL2.override { withStatic = true; }).out}/lib'';
SDL2_INCLUDE_PATH="${SDL2.dev}/include/SDL2";

buildInputs = [
(SDL2.override { withStatic = true; }).out
SDL2.dev
];

The error that was blocking here was lack of:

export cur__root="$SOURCE_ROOT"

So I'm now unstuck (from that error).

Need to figure out path issues now.

Current error is:
substitute(): ERROR: file 'sdl2_wrapper.cpp' does not exist

Path issue.

It is building fine!!! Nevermind!!!