{$IFDEF FPC_LITTLE_ENDIAN}
  {$IFDEF FPC_BIG_ENDIAN}
    {$FATAL Both FPC_LITTLE_ENDIAN and FPC_BIG_ENDIAN defined?!}
  {$ENDIF FPC_BIG_ENDIAN}
{$ELSE FPC_LITTLE_ENDIAN}
  {$IFNDEF FPC_BIG_ENDIAN}
    {$FATAL Neither FPC_LITTLE_ENDIAN, nor FPC_BIG_ENDIAN defined?!}
  {$ENDIF FPC_BIG_ENDIAN}
{$ENDIF FPC_LITTLE_ENDIAN}