Phoronix Test Suite

Checkout this test suite which is now used to compare C5 with Fedora and Ubuntu:
   phoronix-test-suite
GnuPG Test C5 Depends
This test will grab version 2+ from the GnuPG site and build it. C5.4 comes with
version 1.5 or less and doesn't have the supporting libraries needed for the successful build of v. 2+.
Here are the yum calls to grab/install the supporting files:

$sudo yum install libksba.x86_64 libksba-devel
$sudo yum install pth-devel.x86_64 pth.x86_64 libassuan-devel.x86_64 --enablerepo=epel

Voila, the xml results of the GnuPG test.
Running the pts GUI
You will need the php-gtk module for PHP.

D/L the source for  php-gtk.

You will want to build that against php 5.2+, not 5.1 which comes as default.
To update your PHP, use the c5-testing repo
Now,
$sudo yum install php --enablerepo=c5-testing

For the x86_64 bit module I have a tarred version available as php_gtk2.tar.gz.
Copy the SO module to /usr/lib64/php/modules

Then edit your php.ini (/etc/) and add to the relevant section:
extension=php_gtk2.so
Screenshot of PTS GUI