How can I install Ruby 1.9.3 in Mac OS X Mountain Lion without Xcode?

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osx-gcc-installer turns out to be a very good option to replace Xcode in order to install Ruby 1.9.3

These are the steps I have followed:

  1. Download & install the latest version of osx-gcc-installer here (GCC-10.7-v2 is fine): https://github.com/kennethreitz/osx-gcc-installer
  2. Install RVM as usual and select 1.9.3-head as the default ruby installation: https://rvm.io/rvm/install/
  3. Install Homebrew: https://github.com/mxcl/homebrew/wiki/installation
  4. Install libksba to resolve some dependencies with Ruby 1.9.3: brew install libksba

That’s it! You should now have Ruby 1.9.3 installed on Mountain Lion working perfectly.

If you need some other packages, install them now through Homebrew, such as Imagemagick for example: brew install imagemagick

It’s possible that you need XQuartz for Homebrew to work properly, as Apple is not shipping X11 since Mountain Lion. You can download it here: http://xquartz.macosforge.org/trac/wiki

EDIT:

Now (since 29th July) Command line tools for Xcode 4.4 are available.

So, the new steps are these:

  1. Download & install Command line tools for Xcode 4.4 (you don’t need to download Xcode): https://developer.apple.com/downloads/index.action
  2. Install Homebrew: https://github.com/mxcl/homebrew/wiki/installation
  3. Install automake: brew install automake
  4. Install RVM as usual and select 1.9.3-head as the default ruby installation: https://rvm.io/rvm/install/

Optional step: You may need XQuartz for some components, for example for Imagemagick, so download & install XQuartz: http://xquartz.macosforge.org/trac/wiki

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