baseobj = main.obj
-demoobj = demo.obj
-sysobj = gfx.obj vbe.obj dpmi.obj timer.obj keyb.obj logger.obj
+demoobj = demo.obj screen.obj tunnel.obj fract.obj gfxutil.obj
+sysobj = gfx.obj vbe.obj dpmi.obj timer.obj keyb.obj mouse.obj logger.obj
obj = $(baseobj) $(demoobj) $(sysobj)
bin = demo.exe