[TYPO3] typo3 version 4 - upload extension problem

[Ilaria De Marinis]

Hi list,
I installed typo3 version 4.
I try to upload extension without success because of this error:
*"Fatal error*: Call to undefined function gzfile() in 
*/scratch/typo3/typo3_src-4.0.2/typo3/mod/tools/em/class.em_index.php* 
on line *1392"*

Can you help me?
Thank in advance
Ilaria

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De Marinis Ilaria
Settore Automazione Biblioteche
Phone: +3906-44486052
CASPUR - Via dei Tizii ,6 - 00185 Roma
e-mail: demarinis at caspur.it
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