这里选择的是稳定版本的1.2.2版本，2.0版本的不稳定。
wget http://xcache.lighttpd.net/pub/Releases/1.2.2/xcache-1.2.2.tar.gz
tar -zxf xcache-1.2.2.tar.gz
cd xcache
phpize
./configure --enable-xcache
make
make install
记录下xcache的安装目录。
编辑php.ini文件，加入Xcache，作为Zend扩展。
[xcache-common]
;; install as zend extension (recommended), normally "$extension_dir/xcache.so"
zend_extension = /路径/xcache.so
;; or install as extension, make sure your extension_dir setting is correct
; extension = xcache.so
[xcache.admin]
xcache.admin.auth = On
xcache.admin.user = "mOo"
; xcache.admin.pass = md5($your_password)
xcache.admin.pass = ""
[xcache]
xcache.shm_scheme = "mmap"
xcache.size = 32M
xcache.count = 1
xcache.slots = 8K
xcache.ttl = 3600
xcache.gc_interval = 300
; Same as aboves but for variable cache
; If you don't know for sure that you need this, you probably don't
xcache.var_size = 0M
xcache.var_count = 1
xcache.var_slots = 8K
xcache.var_ttl = 0
xcache.var_maxttl = 0
xcache.var_gc_interval = 300
; N/A for /dev/zero
xcache.readonly_protection = Off
xcache.mmap_path = "/dev/zero"
xcache.cacher = On
xcache.stat = On
然后重启下web服务器即可。
php -v 测试下是否有显示Xcache加载成功