rdoc error when generating diagrams

[Shad Sterling]

Error: Could not find/open font : Arial

(it seems to repeat this error for each diagram)

My understanding is that I need to buy a license before I can legally
install Arial; I'd rather tell rdoc to use a different font, but I
couldn't find in the docs how to do that.

How do I tell rdoc to use a different font for diagrams?



Thanks,
- Shad