Depending on what type of neural network you need to run, you may be interested in a system I wrote last year for uni that handles basic NNs. There's not much in the way of an installer, and it's very alpha code, but it's something you can look at and see how others have done it in perl.

I put that code and documentation on that site just a few moments ago in response to this post. Please /msg me if you notice any glaring errors or have anything to contribute.