Laurent: That was indeed the problem. Currently my ruby binary is sitting in /opt/local/bin most likely from a macport install. I am not quite sure what happened to the apple shipped version. Perhaps I should look at replacing that version and removing the /opt/local/bin version. weird. However, after linking the ruby binary in /opt i was able to build :) thanks! Ryan

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Could you run this line manually and see what's going on?

/usr/bin/ruby tool/compile_prelude.rb prelude.rb miniprelude.c.new

Also, did you replace /usr/bin/ruby?

Laurent