While debugging an issue I was somewhat surprised to learn that we've moved src/univalue from https://github.com/jgarzik/univalue to https://github.com/bitcoin-core/univalue, that these repos are both maintained and they're different.
The first mention of using the bitcoin-core repo is from late 2015 in #7157. I didn't check when the last common ancestor commit is.
I couldn't find documentation as to why (these things just happen in open source of course), but at minimum we should make this more clear.
There's also the following line in config.ac that I'm not sure what to do with:
AC_INIT([univalue], [1.0.3],
[http://github.com/jgarzik/univalue/])