[Php-avanzado] symfony / php.ini

[Mario Gomez Cassou]

antes de instalar symfony se sugiere correr un script que revisa que
la configuración de PHP que tenemos es adecuada.  Copio el resultado
que me dio en mi Apache. De los "warnings" que me tira hay un par que
no se que indican, parece que mi php preguntara "que pretende de mi?",
como que no hay instalado ni modulo XSL ni acelerador de PHP (?).
Alguien puede arrojar luz sobre esto?
Desde ya gracias
Mario

********************************
*                              *
*  symfony requirements check  *
*                              *
********************************

php.ini used by PHP: /etc/php5/apache2/php.ini


** Mandatory requirements **

  OK        PHP version is at least 5.2.4 (5.3.2-1ubuntu4.5)

** Optional checks **

  OK        PDO is installed
  OK        PDO has some drivers installed: mysql
  OK        PHP-XML module is installed
[[WARNING]] XSL module is installed: FAILED
            *** Install and enable the XSL module (recommended for Propel) ***
  OK        The token_get_all() function is available
  OK        The mb_strlen() function is available
  OK        The iconv() function is available
  OK        The utf8_decode() is available
  OK        The posix_isatty() is available
[[WARNING]] A PHP accelerator is installed: FAILED
            *** Install a PHP accelerator like APC (highly recommended) ***
[[WARNING]] php.ini has short_open_tag set to off: FAILED
            *** Set it to off in php.ini ***
[[WARNING]] php.ini has magic_quotes_gpc set to off: FAILED
            *** Set it to off in php.ini ***
  OK        php.ini has register_globals set to off
  OK        php.ini has session.auto_start set to off
  OK        PHP version is not 5.2.9