Zenity is required for some apps like winetrick-gtk and its not installed automatically when you install winetricks. The problem is brew install zenity does not work, as such a package does not exist. The question is how can I install it manually in Homebrew?
I have installed zenity using Macports. However, every time I use Homebrew I get a warning complaining that Macports is installed. So if I can install it using Homebrew I will be able to get rid of Macports as I don't use it at all.
The homebrew-x11 tap provides a formula for zenity, so just brew install homebrew/x11/zenity.