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POHow do I upgrade Rails?
 

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  1. POHow do I upgrade Rails?
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    <p>I am new to Ruby <strong>and</strong> Rails, as well as all this command line melarky. So please bear with me.</p> <p>I have installed, RubyGems, Homebrew, RVM, Rails etc, by following various tutorials.</p> <p>I think I have all of this going now, but when I type:</p> <pre><code>rails --version </code></pre> <p>I get, 3.2.12. I notice that Rails 4 is out. How do I upgrade to this version? </p> <p>If I do:</p> <pre><code>gem install rails </code></pre> <p>Even doing:</p> <pre><code>gem update rails </code></pre> <p>I still get 3.2.12.</p> <p>Any ideas?</p> <p><strong>UPDATE</strong></p> <p>When trying a few options here, I get this message returned...</p> <pre><code>Michaels-MacBook-Pro:~ ParanoidAndroid$ gem install rails --version=4.0 Building native extensions. This could take a while... ERROR: Error installing rails: ERROR: Failed to build gem native extension. /usr/local/rvm/rubies/ruby-1.9.3-p392/bin/ruby extconf.rb *** extconf.rb failed *** Could not create Makefile due to some reason, probably lack of necessary libraries and/or headers. Check the mkmf.log file for more details. You may need configuration options. Provided configuration options: --with-opt-dir --without-opt-dir --with-opt-include --without-opt-include=${opt-dir}/include --with-opt-lib --without-opt-lib=${opt-dir}/lib --with-make-prog --without-make-prog --srcdir=. --curdir --ruby=/usr/local/rvm/rubies/ruby-1.9.3-p392/bin/ruby --with-atomic_reference-dir --without-atomic_reference-dir --with-atomic_reference-include --without-atomic_reference-include=${atomic_reference-dir}/include --with-atomic_reference-lib --without-atomic_reference-lib=${atomic_reference-dir}/lib /usr/local/rvm/rubies/ruby-1.9.3-p392/lib/ruby/1.9.1/mkmf.rb:381:in `try_do': The compiler failed to generate an executable file. (RuntimeError) You have to install development tools first. from /usr/local/rvm/rubies/ruby-1.9.3-p392/lib/ruby/1.9.1/mkmf.rb:461:in `try_link0' from /usr/local/rvm/rubies/ruby-1.9.3-p392/lib/ruby/1.9.1/mkmf.rb:712:in `try_run' from extconf.rb:26:in `&lt;main&gt;' Gem files will remain installed in /usr/local/rvm/gems/ruby-1.9.3-p392/gems/atomic-1.1.14 for inspection. Results logged to /usr/local/rvm/gems/ruby-1.9.3-p392/gems/atomic-1.1.14/ext/gem_make.out </code></pre> <p>Seems there's an error happening. Any further ideas?</p> <p>Thanks again everyone!</p>
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    1. USMichael Giovanni Pumo
    1. USMichael Giovanni Pumo
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