Can't get Mailparse installed

Hopefully someone might have experienced this before and knows what to do.

I'm trying to install Blesta, which requires the PECL Mailparse php extension.

[root@hq ~]# pecl install mailparse
pecl/mailparse requires PHP extension "mbstring"
No valid packages found
install failed

So I install mbstring....which says it's already installed (even after an httpd restart)

[root@hq ~]# yum install php-mbstring
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
* base: mirrors.advancedhosters.com
* extras: mirrors.advancedhosters.com
* updates: mirrors.advancedhosters.com
Setting up Install Process
Package php-mbstring-5.3.3-27.el6_5.1.i686 already installed and latest version
Nothing to do
[root@hq ~]#

Any ideas?