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Re:Modern Ruby Development by jimm on Tuesday September 27, 2011 @04:59PM (#3045202)

    source "http://rubygems.org"
should be

    gem source "http://rubygems.org"
Re:Modern Ruby Development by invisiblefunnel on Tuesday September 27, 2011 @05:40PM (#3045352)
The bundler docs show the former: http://gembundler.com/gemfile.html