Undefined reference to

#include <windows.h>
#include <shlobj.h>
#include <QtWidgets>
 
HRESULT GetUIObjectOfFile(HWND hwnd, LPCWSTR pszPath, REFIID riid, void **ppv)
{
    *ppv = NULL;
    HRESULT hr;
    LPITEMIDLIST pidl;
    SFGAOF sfgao;
    if (SUCCEEDED(hr = SHParseDisplayName(pszPath, NULL, &pidl, 0, &sfgao))) 
     {
        IShellFolder *psf;
        LPCITEMIDLIST pidlChild;
        if (SUCCEEDED(hr = SHBindToParent(pidl, IID_IShellFolder, (void**)&psf, &pidlChild))) 
         {
            hr = psf->GetUIObjectOf(hwnd, 1, &pidlChild, riid, NULL, ppv);
            psf->Release();
         }
        CoTaskMemFree(pidl);
     }
    return hr;
}
 
#define SCRATCH_QCM_FIRST 1
 
#define SCRATCH_QCM_LAST  0x7FFF
 
#undef HANDLE_WM_CONTEXTMENU
 
#define HANDLE_WM_CONTEXTMENU(hwnd,wParam,lParam,fn)((fn)((hwnd),(HWND)(wParam),GET_X_LPARAM(lParam),GET_Y_LPARAM(lParam)),0L)
 
void InvokeContextMenu(HWND hwnd, LPWSTR path)
 
{
  POINT pt = { QCursor::pos().x(), QCursor::pos().y() };
  if (pt.x == -1 && pt.y == -1)
    {
    pt.x = pt.y = 0;
    ClientToScreen(hwnd, &pt);
    }
 
  IContextMenu *pcm;
  if (SUCCEEDED(GetUIObjectOfFile(hwnd, path,IID_IContextMenu, (void**)&pcm)))
   {
    HMENU hmenu = CreatePopupMenu();
    if (hmenu) 
     {
      if (SUCCEEDED(pcm->QueryContextMenu(hmenu, 0, SCRATCH_QCM_FIRST, SCRATCH_QCM_LAST,CMF_NORMAL)))
       {
        int iCmd = TrackPopupMenuEx(hmenu, TPM_RETURNCMD, pt.x, pt.y, hwnd, NULL);
        if (iCmd > 0) 
        {
          CMINVOKECOMMANDINFOEX info = { 0 };
          info.cbSize = sizeof(info);
          info.fMask = CMIC_MASK_UNICODE;
          info.hwnd = hwnd;
          info.nShow = SW_SHOWNORMAL;
          pcm->InvokeCommand((LPCMINVOKECOMMANDINFO)&info);
        }
      }
      DestroyMenu(hmenu);
    }
    pcm->Release();
  }
}

win32: LIBS += -lOle32