xapian安装：
$ su
enter your root password
# rpm -ivh http://rpm.eprints.org/rpm-eprints-org-key-1-1.noarch.rpm
# rpm -ivh http://rpm.eprints.org/xapian/6/noarch/rpm-eprints-org-xapian-6-1.noarch.rpm
# yum update
# yum install xapian-omega xapian-bindings-{php,python,tcl8,perl,ruby} xapian目录 http://oligarchy.co.uk/xapian/