Updates to the Rails OS X Build Instructions

I’ve updated and tweaked the Building Ruby on Rails on OS X tutorial to include instructions for installing Subversion (good idea, Duncan).

I’ve also modified them to use a more tried-and-true version of RubyGems, and I re-invited Readline to the party. Seems like some people really missed him.

If you had issues getting everything to work perfectly, and especially if you saw an error like this:

dyld: NSLinkModule() error
dyld: Symbol not found: _rl_filename_completion_function
  Referenced from: /usr/local/lib/ruby/1.8/i686-darwin8.8.4/readline.bundle
  Expected in: flat namespace

Please run through the steps once more.

It’s weird and worth mentioning, however, that I cannot reproduce this error on Intel or PowerPC, even on a fresh install of Mac OS X.

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