TYPO3 4.5:
> t3lib/class.t3lib_div.php:208:define('LF', chr(10));

TYPO3 4.6:
> t3lib/class.t3lib_div.php:31:define('LF', chr(10));

TYPO3 4.7:
> t3lib/class.t3lib_div.php:31:define('LF', chr(10));