Building Ruby 1.9 on Mac OS X 10.5 (Leopard)

I’ve recently been learning Ruby, and I wanted to install Ruby 1.9 on OS X to try out some of the new features (the current ‘stable’ version of Ruby is 1.8.6). Unfortunately, I couldn’t find one cohesive guide to doing this, and instead had to mash together various instructions from across the interwebs. I’ve pieced everything together here in the hope that it’ll help out someone else. 🙂

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