I've never even heard of that one in all my time with Linux, but there are a lot of different distributions.

It looks like it's debian based like Ubuntu.

If you are familiar with the synaptic management tool try searching for python-pyopencl.

Here are instructions for ubuntu. http://bitcointalk.org/index.php?topic=2636.0
If PCLinuxOS is debian based, using current packages, and hasn't changed the package names, those instructions could work.

Be aware that your card is quite old. I had a GTS 250 and was only getting about 2.5 Cents a day running at 30 Mh/s. It looks like your card will get in the 20-25 Mh/s range.