anchor.diff:  {
     Changelog:
     ----------
  +  v.1.31-Alpha; 30.07.2013: Added "sdl_power.h"
     v.1.30-Alpha; 26.07.2013: Added "sdl_thread.h" and "sdl_mutex.h"
     v.1.25-Alpha; 29.07.2013: Added Makros for SDL_RWops
     v.1.24-Alpha; 28.07.2013: Fixed bug with RWops and size_t
  
positive.code: 
    {* SDL_Error() unconditionally returns -1. *}
  function SDL_Error(code: TSDL_ErrorCode): SInt32 cdecl; external {$IFDEF GPC} name 'SDL_Error' {$ELSE} SDL_LibName {$ENDIF};
  
    //from "sdl_thread.h"
  
  
negative.code:   "sdl_keyboard.h",
    "sdl_keycode.h",
    "sdl_pixels.h",
    "sdl_power.h",
    "sdl_main.h",
    "sdl_mouse.h",
    "sdl_mutex.h",
  