Cactiusers.org

Hi, i have some problems with this plugin since I have updated squirrelmail from 1.4.19 to 1.4.20
Environment Ubuntu 10.04
All of this have ubuntu repository:
squirrelmail 2:1.4.20-1
squirrelmail-compatibility 2.0.15-1
squirrelmail-decode 1.2-1
squirrelmail-locales 1.4.18-20090526-1
squirrelmail-lockout 1.6-1
squirrelmail-logger 2.3-3
squirrelmail-quicksave 2.4.3-1
squirrelmail-secure-login 1.4-2
squirrelmail-sent-confirmation 1.6-2
squirrelmail-spam-buttons 2.3.1-1
squirrelmail-viewashtml 3.8-3

And this is the error I get::
Deprecated: Function ereg() is deprecated in /usr/share/squirrelmail/plugins/archive_mail/includes/os.php on line 20

Deprecated: Function ereg() is deprecated in /usr/share/squirrelmail/plugins/archive_mail/includes/os.php on line 23

Deprecated: Function ereg() is deprecated in /usr/share/squirrelmail/plugins/archive_mail/includes/os.php on line 26

Deprecated: Function ereg() is deprecated in /usr/share/squirrelmail/plugins/archive_mail/includes/os.php on line 29

Warning: Cannot modify header information - headers already sent by (output started at /usr/share/squirrelmail/plugins/archive_mail/includes/os.php:20) in /usr/share/squirrelmail/plugins/archive_mail/includes/compression/gzip.php on line 131

Warning: Cannot modify header information - headers already sent by (output started at /usr/share/squirrelmail/plugins/archive_mail/includes/os.php:20) in /usr/share/squirrelmail/plugins/archive_mail/includes/compression/gzip.php on line 138

Warning: Cannot modify header information - headers already sent by (output started at /usr/share/squirrelmail/plugins/archive_mail/includes/os.php:20) in /usr/share/squirrelmail/plugins/archive_mail/includes/compression/gzip.php on line 139

Warning: Cannot modify header information - headers already sent by (output started at /usr/share/squirrelmail/plugins/archive_mail/includes/os.php:20) in /usr/share/squirrelmail/plugins/archive_mail/includes/compression/gzip.php on line 140

Warning: Cannot modify header information - headers already sent by (output started at /usr/share/squirrelmail/plugins/archive_mail/includes/os.php:20) in /usr/share/squirrelmail/plugins/archive_mail/includes/zipit.php on line 78
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and this code continues

Thanks in advance