brew linkapps solidity Warning: brew linkapps has been deprecated and will eventually be removed!
Unfortunately brew linkapps cannot behave nicely with e.g. Spotlight using either aliases or symlinks and Homebrew formulae do not build "proper" .app bundles that can be relocated. Instead, please consider using brew cask and migrate formulae using .apps to casks.
From: http://solidity.readthedocs.io/en/develop/installing-solidity.html