squirrelmail插件change passwd问题

[freedomsky]

gavin@mailtest001:/usr/share/squirrelmail/plugins/change_passwd$ ./ldap-chpasswd
Can't locate Net/DNS/Resolver.pm in @INC (@INC contains: /etc/perl /usr/local/lib/perl/5.8.8 /usr/local/share/perl/5.8.8 /usr/lib/perl5 /usr/share/perl5 /usr/lib/perl/5.8 /usr/share/perl/5.8 /usr/local/lib/site_perl .) at ./ldap-chpasswd line 16.
BEGIN failed--compilation aborted at ./ldap-chpasswd line 16.


我在执行./ldap-chpasswd之后，会出现如上的错误，我不太明白，不知道有人知不知道。谢谢了先