I like the implication that MySQL is the unfortunate technology choice here, rather than PHP. :)

I can follow instructions, but only one of these actually compiles.

EDIT: managed to compile it, it's just the RPM that wouldn't build :P (still wouldn't dare run this on the servers though)

What's so baffling is a behemoth that attracts some of the top engineers would settle for 2 vastly inferior technologies. To be fair, it is a glorified todo / commenting system.

MySQL works pretty well when you treat it as an unreliable network-accessible key/value store; and PHP works pretty well if you treat it as a pure templating language, and also write your own implementation, and also rewrite the language itself to be a different, better language :P

Well, you could look at Gerrit Code Review. It can use its built-in database (H2), MySQL, or Postgres.