[root@hou1-hub1 ~]# pecl install mailparse
downloading mailparse-2.1.1.tgz ...
Starting to download mailparse-2.1.1.tgz (35,883 bytes)
..........done: 35,883 bytes
9 source files, building
running: phpize
Configuring for:
PHP Api Version:         20041225
Zend Module Api No:      20060613
Zend Extension Api No:   220060519
/usr/local/bin/phpize: /tmp/pear/cache/mailparse-2.1.1/build/shtool: /bin/sh: bad interpreter: Permission denied
Cannot find autoconf. Please check your autoconf installation and the $PHP_AUTOCONF
environment variable is set correctly and then rerun this script.

ERROR: `phpize' failed
[root@hou1-hub1 ~]#