How to Install Ruby 1.9.3 in MAC Os X Lion

How can I install Ruby 1.9.3 in Mac OS X Lion?

Try using the clang compiler instead of the default:

rvm install 1.9.3 --with-gcc=clang

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

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:

Download & install the latest version of osx-gcc-installer here (GCC-10.7-v2 is fine): https://github.com/kennethreitz/osx-gcc-installer
Install RVM as usual and select 1.9.3-head as the default ruby installation: https://rvm.io/rvm/install/
Install Homebrew: https://github.com/mxcl/homebrew/wiki/installation
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:

Download & install Command line tools for Xcode 4.4 (you don't need to download Xcode): https://developer.apple.com/downloads/index.action
Install Homebrew: https://github.com/mxcl/homebrew/wiki/installation
Install automake: brew install automake
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

Can't install Ruby 1.9.3 on Mac OSX 10.7.5

RVM has an updated command to install all required libraries:

rvm get head
rvm requirements run

It might ask you for your password (for sudo).

After that run:

rvm install 1.9.3 --with-opt-dir=`brew --prefix readline` --without-tcl --without-tk

Update RVM 1.19+

RVM takes care of it all:

rvm get stable
rvm autolibs homebrew
rvm install 1.9.3

How do you install (build) Ruby 1.9.3 on OSX Lion?

I just ran into this issue myself, and it seem to be an issue with how ruby-1.9.3-125 works with clang. Once I run it against gcc it worked like a charm.

Check to make sure you have the actual gcc installed with which gcc-4.2. If it isn't you'll need to install Xcode or something akin to the os x gcc installer. If it is installed running rvm install 1.9.3 --with-gcc=gcc-4.2 is what did the trick for me.

Can't install Ruby 1.9.3 via rvm in OS X Lion even with --with-gcc=clang

This should solve it:

rvm get head
rvm install 1.9.3 --autolibs=4