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copied!<p>Try running JRuby in 1.9 mode. Rails' (and probably others?) gemspec file is not properly parsed by yecht(the old syck-compatible YAML engine). psych (the new one, available in 1.9 mode) should handle this fine. Since MRI's syck appears to have similar problem with the gemspec, I suspect MRI 1.8 similarly fails to install rails.</p> <p>For example:</p> <pre><code>$ GEM_HOME=$HOME/gems GEM_PATH=$GEM_HOME jruby --1.9 -S gem install rails -v 3.2.0.rc1 Fetching: i18n-0.6.0.gem (100%) Fetching: multi_json-1.0.4.gem (100%) Fetching: activesupport-3.2.0.rc1.gem (100%) Fetching: builder-3.0.0.gem (100%) Fetching: activemodel-3.2.0.rc1.gem (100%) Fetching: rack-1.3.6.gem (100%) Fetching: rack-cache-1.1.gem (100%) Fetching: rack-test-0.6.1.gem (100%) Fetching: journey-1.0.0.rc4.gem (100%) Fetching: hike-1.2.1.gem (100%) Fetching: tilt-1.3.3.gem (100%) Fetching: sprockets-2.1.2.gem (100%) Fetching: erubis-2.7.0.gem (100%) Fetching: actionpack-3.2.0.rc1.gem (100%) Fetching: arel-3.0.0.rc1.gem (100%) Fetching: tzinfo-0.3.31.gem (100%) Fetching: activerecord-3.2.0.rc1.gem (100%) Fetching: activeresource-3.2.0.rc1.gem (100%) Fetching: mime-types-1.17.2.gem (100%) Fetching: polyglot-0.3.3.gem (100%) Fetching: treetop-1.4.10.gem (100%) Fetching: mail-2.3.0.gem (100%) Fetching: actionmailer-3.2.0.rc1.gem (100%) Fetching: rake-0.9.2.2.gem (100%) Fetching: thor-0.14.6.gem (100%) Fetching: rack-ssl-1.3.2.gem (100%) Fetching: json-1.6.4-java.gem (100%) Fetching: rdoc-3.12.gem (100%) Depending on your version of ruby, you may need to install ruby rdoc/ri data: <= 1.8.6 : unsupported = 1.8.7 : gem install rdoc-data; rdoc-data --install = 1.9.1 : gem install rdoc-data; rdoc-data --install >= 1.9.2 : nothing to do! Yay! Fetching: railties-3.2.0.rc1.gem (100%) Fetching: bundler-1.0.21.gem (100%) Fetching: rails-3.2.0.rc1.gem (100%) Successfully installed i18n-0.6.0 Successfully installed multi_json-1.0.4 Successfully installed activesupport-3.2.0.rc1 Successfully installed builder-3.0.0 Successfully installed activemodel-3.2.0.rc1 Successfully installed rack-1.3.6 Successfully installed rack-cache-1.1 Successfully installed rack-test-0.6.1 Successfully installed journey-1.0.0.rc4 Successfully installed hike-1.2.1 Successfully installed tilt-1.3.3 Successfully installed sprockets-2.1.2 Successfully installed erubis-2.7.0 Successfully installed actionpack-3.2.0.rc1 Successfully installed arel-3.0.0.rc1 Successfully installed tzinfo-0.3.31 Successfully installed activerecord-3.2.0.rc1 Successfully installed activeresource-3.2.0.rc1 Successfully installed mime-types-1.17.2 Successfully installed polyglot-0.3.3 Successfully installed treetop-1.4.10 Successfully installed mail-2.3.0 Successfully installed actionmailer-3.2.0.rc1 Successfully installed rake-0.9.2.2 Successfully installed thor-0.14.6 Successfully installed rack-ssl-1.3.2 Successfully installed json-1.6.4-java Successfully installed rdoc-3.12 Successfully installed railties-3.2.0.rc1 Successfully installed bundler-1.0.21 Successfully installed rails-3.2.0.rc1 31 gems installed </code></pre>

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