Just a heads up for you folks out there. I tried to install on a CentOS server and every time I ran ./install I would get the following.
Configuring for: PHP Api Version: 20090626 Zend Module Api No: 20090626 Zend Extension Api No: 220090626 configure.in:8: warning: LT_AC_PROG_SED is m4_require'd but not m4_defun'd acinclude.m4:2636: PHP_CONFIG_NICE is expanded from... configure.in:8: the top level ./install: line 69: libtoolize: command not found
After some research for over an hour (I thought it was related to something wrong with my mcrypt extension), all you have to do is run.
yum install libtool
And it worked like a charm.
Hope this helps.