安装了支持ldap的webmail4个分别是：webmail；squirrelmail；horde和extmail。
前三个都使用正常，可是登陆进extmail，却出现
Can't locate Net/LDAP.pm in @INC (@INC contains: /var/www/extsuite/extmail/libs /usr/lib/perl5/site_perl/5.8.8/i386-linux-thread-multi /usr/lib/perl5/site_perl/5.8.7/i386-linux-thread-multi /usr/lib/perl5/site_perl/5.8.6/i386-linux-thread-multi /usr/lib/perl5/site_perl/5.8.5/i386-linux-thread-multi /usr/lib/perl5/site_perl/5.8.8 /usr/lib/perl5/site_perl/5.8.7 /usr/lib/perl5/site_perl/5.8.6 /usr/lib/perl5/site_perl/5.8.5 /usr/lib/perl5/site_perl /usr/lib/perl5/vendor_perl/5.8.8/i386-linux-thread-multi /usr/lib/perl5/vendor_perl/5.8.7/i386-linux-thread-multi /usr/lib/perl5/vendor_perl/5.8.6/i386-linux-thread-multi /usr/lib/perl5/vendor_perl/5.8.5/i386-linux-thread-multi /usr/lib/perl5/vendor_perl/5.8.8 /usr/lib/perl5/vendor_perl/5.8.7 /usr/lib/perl5/vendor_perl/5.8.6 /usr/lib/perl5/vendor_perl/5.8.5 /usr/lib/perl5/vendor_perl /usr/lib/perl5/5.8.8/i386-linux-thread-multi /usr/lib/perl5/5.8.8) at /var/www/extsuite/extmail/libs/Ext/Auth/LDAP.pm line 13. BEGIN failed--compilation aborted at /var/www/extsuite/extmail/libs/Ext/Auth/LDAP.pm line 13. Compilation failed in require at /var/www/extsuite/extmail/libs/Ext/App.pm line 340