Haskell compile DLL without copy-past ghc/include folder

Question

I successfully created a DLL in Haskell. My problem is that everytime I want to compile a test program which loads and uses a function of my DLL I need to copy/paste files from C:\tools\ghc-9.0.1\include in my working directory.

The following files are:

HsFFI.h
ghcconfig.h
ghcautoconf.h
ghcplatform.h
stg/Types.h

I followed the tutorial on their documentation https://downloads.haskell.org/~ghc/7.6.3/docs/html/users_guide/win32-dlls.html but used other compiler commands to make it work.

This is my Adder.hs file

{-# LANGUAGE ForeignFunctionInterface #-}
module Adder where

adder :: Int -> Int -> IO Int
adder x y = return (x+y)

foreign export ccall adder :: Int -> Int -> IO Int

This is my StartEnd.c file to start Haskell runtime

#include <Rts.h>

void HsStart()
{
   int argc = 1;
   char* argv[] = {"ghcDll", NULL}; // argv must end with NULL

   // Initialize Haskell runtime
   char** args = argv;
   hs_init(&argc, &args);
}

void HsEnd()
{
   hs_exit();
}

This is my MyDef.def file to add my functions

EXPORTS
  adder
  HsStart
  HsEnd

I compiled Adder.hs by writing ghc -shared Adder.hs StartEnd.c -o Adder.dll Mydef.def

This is my test.cpp file on c++. I wrote #include "HsFFI.h" to copy/paste HsFFI.h into my working directory as it couldn't find this file by itself when writing #include <HsFFI.h>. I compiled test.cpp by writing g++ -o test test.cpp Adder.dll.a My guess is that i need to make an environment variable so g++ can find this file, but how should i name this variable so g++ can find this file?

#include "HsFFI.h"
#include "Adder_stub.h"
#include <stdio.h>

extern "C" {
    void HsStart();
    void HsEnd();
}

int main()
{
    HsStart();
    // can now safely call functions from the DLL
    printf("12 + 5 = %i\n", adder(12,5))    ;
    HsEnd();
    return 0;
}

I used ghc-9.0.1 and windows10.