Recently, I had upgraded my machine from version 10.8.5 to 10.9.2 (Mavericks) and immediately noticed some issues with it.

Notably, many of my binaries were no longer working that I had installed with Homebrew.

If you see these issues, you can fix it in one command…

1
brew update && brew upgrade

Once you do this, your binaries linked with brew should now work again! (hopefully..)