Well, I'll admit this is the first I'm learning of this tool. That said…
The top hit on Google for "os x pkgbuild" is a link into Apple's documentation that 404s. (Further Googling turns up some blog posts, and man pages, so that's good.) Does this support dependencies? How do I get updates to users? How does a user receive updates?
Wow...I'm not sure why Apple has taken down it's documentation for the command-line tools. It's been so long since I looked at anything beyond the man pages, I didn't realize the web docs weren't up. If I had to hazard a guess, I'd bet they're trying to move developers towards an XCode-centric approach. But there are plenty of other tools that can generate that format too. And it's the only format that's natively understood by the OS, so I still stand by my assertion that Homebrew is not the official package manager for Mac.
It might not be the official package manager, but what was claimed is that it is the primary package manager. I’d wager that Homebrew is more used than... I don’t even remember what you mentioned as the other one as I’ve never heard of it before and have never used it.
The top hit on Google for "os x pkgbuild" is a link into Apple's documentation that 404s. (Further Googling turns up some blog posts, and man pages, so that's good.) Does this support dependencies? How do I get updates to users? How does a user receive updates?