Installing RVM on OS X Mountain Lion

install-rvm-on-mountain-lion.sh

# When Mac OS X Mountain Lion was released, I did a completely clean install. Unfortunately [RVM](http://rvm.io) won't install directly on the stock release. Here are the steps to get the installation working. 
# This gist is based in part by [this post](http://theengguy.blogspot.ca/2012/04/setting-up-os-x-lion-and-mountain-lion.html) by [@theengguy](http://twitter.com/theengguy).

# 1. Install [MacPorts](http://www.macports.org)
# You can snag the package installer (easiest) from [https://distfiles.macports.org/MacPorts/MacPorts-2.1.2-10.8-MountainLion.pkg](https://distfiles.macports.org/MacPorts/MacPorts-2.1.2-10.8-MountainLion.pkg)

# 2. Install a new version of curl
sudo port -v selfupdate
sudo port install curl

# This will install another, more up to date version of curl to /opt/local/bin/curl. Mountain Lion ships with 7.25.0 and you need at least 7.26.0 in order to avoid libcurl error, "(48) An unknown option was passed in to libcurl" while trying to install RVM

# 3. Check the curl version and make it active
/opt/local/bin/curl -V

# Make sure the output is >= 7.26.0

# 3. Install RVM by running the following commands from [@theengguy](http://twitter.com/theengguy);
sudo port -v selfupdate
sudo port install apple-gcc42
sudo port install gmake
sudo port install gpatch
sudo ln -s /opt/local/bin/gcc-apple-4.2 /opt/local/bin/gcc
sudo ln -s /opt/local/bin/gmake /opt/local/bin/make
sudo ln -s /opt/local/bin/gpatch /opt/local/bin/patch
curl -L get.rvm.io | bash -s stable
source ~/.rvm/scripts/'rvm'
export PATH=/opt/local/bin:$PATH
rvm install 1.9.3
rvm use 1.9.3@rails3tutorial2ndEd --create --default
gem install rubygems-update
gem update --system
rvm use 1.9.3

# You should have a working installation of RVM with Ruby 1.9.3 installed