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Re:Ruby 1.9.3 via RVM on Mac OSX Lion: Success Story by edgardcastro on Monday February 13, 2012 @11:39AM (#3586195)
Same here, no problem. Lion and Xcode 4.2.

Remember that after downloading Xcode form App Store you actually have to INSTALL it and after RUN IT at least once so everything works properly.

Re:Ruby 1.9.3 via RVM on Mac OSX Lion: Success Story by lloeki on Monday February 13, 2012 @04:22PM (#3587394)
Please reread, including comments in the linked github post. 1.9.3 does compile with clang, but ruby's own test suite ('make test' in the ruby build dir) does not pass.

Also, if you had 4.1 then upgraded to 4.2 you may still have 4.1 gcc around.