~$ brew doctor
Please note that these warnings are just used to help the Homebrew maintainers
with debugging if you file an issue. If everything you use Homebrew for is
working fine: please don't worry and just ignore them. Thanks!
Warning: You have unlinked kegs in your Cellar
Leaving kegs unlinked can lead to build-trouble and cause brews that depend on
those kegs to fail to run properly once built. Run `brew link` on these:
Warning: Broken symlinks were found. Remove them with `brew prune`:
Warning: Some installed formula are missing dependencies.
You should `brew install` the missing dependencies:
brew install socat
Run `brew missing` for more details.