Just tested this and works ok. Leopard comes with 1.8.6, my box has 1.8.7 so best to keep them uniform for better code reliance.
What this’ll do is replace your current version of Ruby without replacing the one supplied by Apple. Their’s is stored in /usr/bin/ruby, your’s will be stored in /usr/local/bin/ruby then hooked up with the PATH directive.
So in Terminal
sudo port install wget
wget ftp://ftp.ruby-lang.org/pub/ruby/stable-snapshot.tar.gz
tar -xzvf stable*.tar.gz
cd ruby
Configure & Build Ruby for Leopard
./configure --prefix=/usr/local --enable-pthread
sudo make
sudo make install
Add the files to your Terminal’s path
mate ~/.bash_profile
Add and Save this line
export PATH=/usr/local/bin:$PATH
Refresh Terminal,
ruby -v
=> ruby 1.8.7 (2009-01-23 revision 0) [i386-darwin9.6.0]
Gems
Because this’ll effectively give you another version of Ruby taking over from the supplied one, you’ll have to re-install RubyGems, sorry….
wget http://rubyforge.org/frs/download.php/45905/rubygems-1.3.1.tgz
tar -xzvf rubygems*.tgz
cd rubygems*
sudo ruby setup.rb
Here’s some install commands to get you started from my last setup
sudo gem install rails rake mysql mongrel mongrel_cluster thin capistrano termios sqlite3-ruby mini_magick ZenTest liquid rcov RubyInline image_science
MySQL is a pig on Leopard so this will get that gem working again
sudo env ARCHFLAGS="-arch i386" gem install mysql -- \ --with-mysql-dir=/usr/local/mysql --with-mysql-lib=/usr/local/mysql/lib \ --with-mysql-include=/usr/local/mysql/include
Then some of my favourites…
gem sources -a http://gems.github.com
sudo gem install ultrasphinx rdiscount RedCloth twitter4r mislav-will_paginate fastercsv
…gotta dash, still on season 2 of 24, girlfriend won’t let me watch day 7 until i’ve seen the rest ;–)