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iversonc (3) [Avatar] Offline
p. 29 of the text shows an icon for a MacRuby Application, however, in Xcode 4.3.2 after installing MacRuby 0.10, I don't see that option. Did I miss a step?
iversonc (3) [Avatar] Offline
Problem fixed with update to latest nightly build of MacRuby 0.12
Found a fix on StackOverflow:

Answer repeated below:

"To fix this issue you need to update MacRuby to the latest build which would be the nightly build available there:

0.12 is about to be released (0.11 is going to be skipped), but the nightly build is very stable."