#include "simple_test1.h"

Fl_Double_Window* make_window() {
  Fl_Double_Window* w;
  { Fl_Double_Window* o = new Fl_Double_Window(400, 283);
    w = o;
    { Fl_Tile* o = new Fl_Tile(10, 5, 380, 260);
      o->box(FL_FLAT_BOX);
      o->color((Fl_Color)5);
      { Fl_Box* o = new Fl_Box(10, 5, 190, 260);
        o->box(FL_FLAT_BOX);
        o->color((Fl_Color)30);
      } // Fl_Box* o
      { Fl_Box* o = new Fl_Box(200, 5, 190, 260);
        o->box(FL_FLAT_BOX);
        o->color((Fl_Color)20);
      } // Fl_Box* o
      { Fl_Button* o = new Fl_Button(265, 40, 100, 110);
        o->color((Fl_Color)177);
      } // Fl_Button* o
      o->end();
    } // Fl_Tile* o
    o->end();
  } // Fl_Double_Window* o
  return w;
}
simple_test2.h
-----------------------------------------------
#ifndef simple_test1_h
#define simple_test1_h
#include <FL/Fl.H>
#include <FL/Fl_Double_Window.H>
#include <FL/Fl_Tile.H>
#include <FL/Fl_Box.H>
#include <FL/Fl_Button.H>
Fl_Double_Window* make_window();
#endif