Virtual Directory Support?

I was wondering if anyone can tell me how to enable “Virtual Directory Support”. I have a custom install of PHP5 on my domains. I’m getting an error when trying to do this function on my page :

Here’s the error I’m getting on the page:

First, that is only supported when php is installed as an apache module. That isn’t the default here on DreamHost. Are you running as an Apache Module?

Second, it looks like mod_include must be enabled, and I doubt it is.

Is there are reason you need to use that rather than include() or require()?

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