Getting RMagick working with Mountain Lion

So, had to upgrade to Mountain Lion just now due to a client reporting a bug in our application. First thing I noticed is, all my rails projects that use RMagick stopped working. Basically the OS update broke my installation of ImageMagick+RMagick.

Managed to fix it following these steps:

1. Installed XCode 4.4 and Command Line Tools

2. Ran this in terminal:

   sudo chown -R <user> /usr/local

   brew update

   brew tap homebrew/dupes

   brew install apple-gcc42

3. Installed XQuartz 2.7.2 (http://xquartz.macosforge.org/landing)

4. Fixed any errors reported by brew doctor

5. Ran this in terminal:

   gem uninstall rmagick

   brew uninstall imagemagick

   brew install --fresh imagemagick

   gem install rmagick

After this, RMagick worked flawlessly again!

Disclaimer: these steps are combination of the indications on these two posts which have been a great help (otherwise I would still be banging my head trying to figure out how to fix this):
http://robots.thoughtbot.com/post/27985816073/the-hitchhikers-guide-to-riding-a-mountain-lion
http://tektastic.com/2012/07/getting-rmagic-and-friends-to-work-on.html