Having just installed Mountain Lion on my MBA, I encounted a few small problems while trying to install RVM as well as Ruby, etc. Below are the steps I took to get Ruby on Rails up and running on my new Mountain Lion install.
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Step 1. Install XCode (this isn't required but it's best to install it)
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Step 2. Install the XCode Command Line Tools from developer.apple.com. Note you need to download the 10.8 command line tools which is at the bottom of the list on XCode 4.4. I made the mistake of downloading the 10.7 Lion set first!
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Step 3. Install XQuartz
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Step 4. Install HomeBrew
ruby -e "$(curl -fsSkL raw.github.com/mxcl/homebrew/go)" -
Step 5. Check that HomeBrew works OK brew doctor
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Step 6. Install GCC 4.2 because Mountain Lion doesn't come with it by default.
brew tap homebrew/dupes brew install apple-gcc42 sudo ln -s /usr/local/bin/gcc-4.2 /usr/bin/gcc-4.2
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Step 7. Install RVM
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Step 8. Install Ruby!
rvm install 1.9.3for the latest version of Ruby 1.9.3 -
Step 9. Set 1.9.3 as the default ruby -
rvm use 1.9.3 --default -
Step 10. Install the base gems -
gem install rails bundler -
Step 11. Install Pow which is a brilliant Ruby development server. No need to keep running rails server all the time.
curl get.pow.cx | sh -
Step 12. Install Git
brew install git -
Step 13. (optional). Install MySQL using homebrew brew install mysql. It looks like Java is required as well during installation for some reason.
Source: http://blog.dean.io/posts/setting-up-a-ruby-on-rails-development-environment-on-mountain-lion