系统CentOS 6.5 PHP5.5.19
1、安装imap的依赖包：
[root@iZ9482lp6yqZ]# yum install -y libc-client-*
没有安装编译错误提示：
configure: error: utf8_mime2text() has new signature, but U8T_CANONICAL is missing. This should not happen. Check config.log for additional information.
解决Cannot find imap library (libc-client.a)错误提示：
[root@iZ9482lp6yqZ]# ln -s /usr/lib64/libc-client.so /usr/lib/libc-client.so
2、进入php源码中的imap目录
[root@iZ9482lp6yqZ no-debug-non-zts-]# cd /usr/local/php-5.5./ext
[root@iZ9482lp6yqZ imap]# /usr/local/php/bin/phpize
[root@iZ9482lp6yqZ imap]# ./configure --with-php-config=/usr/local/php/bin/php-config --with-imap --with-imap-ssl --with-kerberos
[root@iZ9482lp6yqZ imap]# make
[root@iZ9482lp6yqZ imap]# make install
3、把imap.so扩展加到php.ini：
extension = imap.so
4、重启httpd：
[root@iZ9482lp6yqZ conf]# service httpd restart