Error installing mysql2: Failed to build gem native extension
gem install: Failed to build gem native extension (can't find header files)
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Uninitialized constant ActiveSupport::Dependencies::Mutex (NameError)
bundle install fails with SSL certificate verification error
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The 'json' native gem requires installed build tools
Library not loaded: libmysqlclient.16.dylib error when trying to run 'rails server' on OS X 10.6 with mysql2 gem
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Installing gem or updating RubyGems fails with permissions error