I have just installed Sequel using the command sudo macgem install sequel. It tells me sequel-3.18.0 was successfully installed.
sudo macgem install sequel
When I fire up xcode, and s
MacRuby (like IronRuby) currently doesn't implement enough of the ruby language to work with Sequel. Sequel is tested on MRI (1.8 and 1.9), JRuby, and Rubinius, so you could try one of them.