Extmail登录出现的问题....

我的Extmail安装好后,用户登录后出现这样的情况(下面给出的提示),我用的是Posfix邮件服务器系统,我的其它辅助服务也安装了,如:Cyrus-sasl courier-authlib courier-imap 都已安装好;我从提示给出上看,有个Perl-DBD-MySQL 没有安装,我去安装这个软件包的时候不能安装,因为我之前在安装Postfix时,我安装了MySQL-shared-community-5.0.41.-0.rhel4.i386.rpm 如果这个包不安装Postfix启动不了.现在在安装Perl-DBD-MySQL 跟MySQL-shared-community-5.0.41.-0.rhel4.i386.rpm 有冲突.
请高手们指教......

install_driver(mysql) failed: Can't locate DBD/mysql.pm in @INC (@INC contains: /usr/local/apache20/cgi-bin/extmail/libs /usr/lib/perl5/5.8.5/i386-linux-thread-multi /usr/lib/perl5/5.8.5 /usr/lib/perl5/site_perl/5.8.5/i386-linux-thread-multi /usr/lib/perl5/site_perl/5.8.4/i386-linux-thread-multi /usr/lib/perl5/site_perl/5.8.3/i386-linux-thread-multi /usr/lib/perl5/site_perl/5.8.2/i386-linux-thread-multi /usr/lib/perl5/site_perl/5.8.1/i386-linux-thread-multi /usr/lib/perl5/site_perl/5.8.0/i386-linux-thread-multi /usr/lib/perl5/site_perl/5.8.5 /usr/lib/perl5/site_perl/5.8.4 /usr/lib/perl5/site_perl/5.8.3 /usr/lib/perl5/site_perl/5.8.2 /usr/lib/perl5/site_perl/5.8.1 /usr/lib/perl5/site_perl/5.8.0 /usr/lib/perl5/site_perl /usr/lib/perl5/vendor_perl/5.8.5/i386-linux-thread-multi /usr/lib/perl5/vendor_perl/5.8.4/i386-linux-thread-multi /usr/lib/perl5/vendor_perl/5.8.3/i386-linux-thread-multi /usr/lib/perl5/vendor_perl/5.8.2/i386-linux-thread-multi /usr/lib/perl5/vendor_perl/5.8.1/i386-linux-thread-multi /usr/lib/perl5/vendor_perl/5.8.0/i386-linux-thread-multi /usr/lib/perl5/vendor_perl/5.8.5 /usr/lib/perl5/vendor_perl/5.8.4 /usr/lib/perl5/vendor_perl/5.8.3 /usr/lib/perl5/vendor_perl/5.8.2 /usr/lib/perl5/vendor_perl/5.8.1 /usr/lib/perl5/vendor_perl/5.8.0 /usr/lib/perl5/vendor_perl .) at (eval 2) line 3. Perhaps the DBD::mysql perl module hasn't been fully installed, or perhaps the capitalisation of 'mysql' isn't right. Available drivers: ExampleP, Proxy, Sponge. at /usr/local/apache20/cgi-bin/extmail/libs/Ext/Auth/MySQL.pm line 44 [/td][/tr][tr][td]
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