1.下载安装包
新版本是libevent-2.0.10-stable。（如果你的系统已经安装了libevent，可以不用安装）
官网：http://www.monkey.org/~provos/libevent/
下载：http://www.monkey.org/~provos/libevent-2.0.10-stable.tar.gz
2.解压
# tar zxvf libevent-2.0.10-stable.tar.gz
3.进入目录
# cd libevent-2.0.10-stable
4. 切换到root
# su
5.安装gcc
# yum install gcc
6.设置安装路径
# ./configure –prefix=/usr
7.编译
# make
8.安装
# make install
3.测试libevent是否安装成功：
# ls -al /usr/lib | grep libevent
lrwxrwxrwx 1 root root 21 11?? 12 17:38 libevent-1.2.so.1 -> libevent-1.2.so.1.0.3
-rwxr-xr-x 1 root root 263546 11?? 12 17:38 libevent-1.2.so.1.0.3
-rw-r–r– 1 root root 454156 11?? 12 17:38 libevent.a
-rwxr-xr-x 1 root root 811 11?? 12 17:38 libevent.la
lrwxrwxrwx 1 root root 21 11?? 12 17:38 libevent.so -> libevent-1.2.so.1.0.3
还不错，都安装上了。
http://blog.csdn.net/zhangm168/article/details/6272801
安装memcache时，需要建立文件索引或者说文件连接（link），类似windows下的快捷方式
启动服务时出现 error while loading shared libraries: libevent-2.0.so.5: cannot open shared object file: No such file or directory
>whereis libevent-2.0.so.5
libevent-2.0.so.5: /usr/local/lib/libevent-2.0.so.5
> ldd /usr/local/bin/memcached （ldd指令不熟悉的去查看下）
libevent-2.0.so.5 => not found （没有找到该文件）
libpthread.so.0 => /lib64/libpthread.so.0 (0x00002b83fce0e000)
libc.so.6 => /lib64/libc.so.6 (0x00002b83fd029000)
librt.so.1 => /lib64/librt.so.1 (0x00002b83fd381000)
/lib64/ld-linux-x86-64.so.2 (0x00002b83fc9b0000)
> LD_DEBUG=libs ./memcached -v
找到默认路径 /usr/lib/
>sudo ln -s /usr/lib/libevent-2.0.so.5 /usr/lib64/libevent-2.0.so.5
>sudo ldd /usr/local/bin/memcached
libevent-2.0.so.5 => /usr/lib64/libevent-2.0.so.5 (0x00002b83fcbcd000)
libpthread.so.0 => /lib64/libpthread.so.0 (0x00002b83fce0e000)
libc.so.6 => /lib64/libc.so.6 (0x00002b83fd029000)
librt.so.1 => /lib64/librt.so.1 (0x00002b83fd381000)
/lib64/ld-linux-x86-64.so.2 (0x00002b83fc9b0000)
现在好啦，：）