My number one annoyance about many open source projects is that they often don't compile out of the box. I can't even count the number of times I've downloaded

My number one annoyance about many open source projects is that they often don't compile out of the box. I can't even count the number of times I've downloaded a library only to have it fail miserably on compile because of some strange state the author left the source code in, or a library he wrote and failed to include. Etc etc.