mysql.hにパスが通らない話。

ruby – Gem mysql2 doesn’t compile with the latest mysql, 5.6.12, in MacOS X with Homebrew – Stack Overflow

I had the same problem, I managed to fix it. I did a lot of things, and I don’t know for sure what it was, but going to MySQL 5.6.10 seems to have worked.

環境壊したかと思ってもがいてたらどうも既知でした、っていう。
Stack Overflowにはなんでもあるなぁ。