I did run into one problem while installing this extension on 5.5.3, Ubuntu 12.04, and that was the missing libpcre3. Once I installed the lib the install went fine.
sudo apt-get install libpcre3
sudo pecl install SPL_Types
This » PECL extension is not bundled with PHP.
Information for installing this PECL extension may be found in the manual chapter titled Installation of PECL extensions. Additional information such as new releases, downloads, source files, maintainer information, and a CHANGELOG, can be located here: » http://pecl.php.net/package/SPL_Types.
A DLL for this PECL extension is currently unavailable. See also the building on Windows section.