问题：
[root@monitor pdo_mysql]# phpize
Configuring for:
PHP Api Version: 20090626
Zend Module Api No: 20090626
Zend Extension Api No: 220090626
config.m4:138: warning: AC_CACHE_VAL(pdo_inc_path, …): suspicious cache-id, must contain _cv_ to be cached
../../lib/autoconf/general.m4:1974: AC_CACHE_VAL is expanded from…
../../lib/autoconf/general.m4:1994: AC_CACHE_CHECK is expanded from…
aclocal.m4:2748: PHP_CHECK_PDO_INCLUDES is expanded from…
config.m4:138: the top level
config.m4:138: warning: AC_CACHE_VAL(pdo_inc_path, …): suspicious cache-id, must contain _cv_ to be cached
../../lib/autoconf/general.m4:1974: AC_CACHE_VAL is expanded from…
../../lib/autoconf/general.m4:1994: AC_CACHE_CHECK is expanded from…
aclocal.m4:2748: PHP_CHECK_PDO_INCLUDES is expanded from…
config.m4:138: the top level
解决方法：
yum install -y autoconf
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