Update: Homebrew was fixed while Yosemite was in beta. If you are running into problems after upgrading to Yosemite you can easily fix Homebrew by doing a git pull from /usr/local or do a brew update before updating your system to Yosemite. In other words it is no longer needed to make changes to your Homebrew install manually. Some great work by the Homebrew team!
Now that Apple opened up the beta program of their Desktop OS to everyone (not requiring a developer license anymore) a lot of people will be upgrading to OS X 10.10 already before the official release later on this year. I did it as well earlier this week, however I found out that one of my all time favourite “programs” was not working anymore on OS X 10.10. Homebrew, for those who don’t know it is “the missing package manager for OS X” and really saves a lot of time and trouble trying to install software on your mac system. It is like the ports collection from *BSD only for your Mac.