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POWhy do I get an error installing the JSON gem in Ubuntu?
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  1. POWhy do I get an error installing the JSON gem in Ubuntu?
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    copied!<p>Using Ubuntu, when I run "<code>bundle install</code>" to set up my Rails environment, it throws an error during the JSON gem installation:</p> <pre><code>Installing json (1.7.3) with native extensions Gem::Installer::ExtensionBuildError: ERROR: Failed to build gem native extension. /usr/bin/ruby1.9.1 extconf.rb /usr/lib/ruby/1.9.1/rubygems/custom_require.rb:36:in `require': cannot load such file -- mkmf (LoadError) from /usr/lib/ruby/1.9.1/rubygems/custom_require.rb:36:in `require' from extconf.rb:1:in `&lt;main&gt;' Gem files will remain installed in /home/danny/.bundler/tmp/2040/gems/json-1.7.3 for inspection. Results logged to /home/danny/.bundler/tmp/2040/gems/json-1.7.3/ext/json/ext/parser/gem_make.out An error occured while installing json (1.7.3), and Bundler cannot continue. Make sure that `gem install json -v '1.7.3'` succeeds before bundling. </code></pre> <p>When I try installing only the JSON 1.7.3 gem it also gives me an error:</p> <pre><code>Building native extensions. This could take a while... ERROR: Error installing json: ERROR: Failed to build gem native extension. /usr/bin/ruby1.9.1 extconf.rb /usr/lib/ruby/1.9.1/rubygems/custom_require.rb:36:in `require': cannot load such file -- mkmf (LoadError) from /usr/lib/ruby/1.9.1/rubygems/custom_require.rb:36:in `require' from extconf.rb:1:in `&lt;main&gt;' Gem files will remain installed in /var/lib/gems/1.9.1/gems/json-1.7.3 for inspection. Results logged to /var/lib/gems/1.9.1/gems/json-1.7.3/ext/json/ext/parser/gem_make.out </code></pre> <p>I've installed RVM and am running Ruby 1.9.3; Why can't it install the JSON gem?</p>
 

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