CentOS 6.5 WARNING: You will need re2c 0.13.4 or later if you want to regenerate PHP parsers.

环境：CentOS 6.5 64bit

PHP版本：5.3.3

在安装php geoip扩展时，执行./configure后有WARNING：

configure: WARNING: You will need re2c 0.13.4 or later if you want to regenerate PHP parsers.

看来需要升级re2c到版本至少：0.13.4

re2c的介绍：http://re2c.org/

下载源代码安装：

[root@localhost Downloads]# wget https://sourceforge.net/projects/re2c/files/0.16/re2c-0.16.tar.gz --no-check-certificate

[root@localhost Downloads]# tar zxvf re2c-0.16.tar.gz

[root@localhost Downloads]# cd re2c-0.16

[root@localhost re2c-0.16]# ./configure

[root@localhost re2c-0.16]# make

[root@localhost re2c-0.16]# make install

检查安装：

[root@localhost re2c-0.16]# whereis re2c
re2c: /usr/local/bin/re2c

[root@localhost re2c-0.16]# re2c --version
re2c 0.16

再次安装php geoip扩展时，执行./configure后，不再有WARNING。