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POFailed to build gem native extension: Unable to install Rails + MySQL2
 

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  1. POFailed to build gem native extension: Unable to install Rails + MySQL2
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    <p>I am on MAC OS X LION and keep getting error message Failed to build gem native extension when trying to install rails and mysql.</p> <p>This is what I am doing. I enter:</p> <pre><code> $ sudo gem install rails </code></pre> <p><strong>Error message</strong></p> <pre><code>Building native extensions. This could take a while... ERROR: Error installing rails: ERROR: Failed to build gem native extension. /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/bin/ruby extconf.rb mkmf.rb can't find header files for ruby at /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/ruby.h Gem files will remain installed in /Library/Ruby/Gems/1.8/gems/json-1.6.5 for inspection. Results logged to /Library/Ruby/Gems/1.8/gems/json-1.6.5/ext/json/ext/parser/gem_make.out ingjerd$ ruby -v ruby 1.8.7 (2010-01-10 patchlevel 249) [universal-darwin11.0] </code></pre> <p><strong>The same happens when I try to install mysql2 gem.</strong> </p> <p>When I do the command </p> <pre><code> gem list </code></pre> <p>Then rails and mysql is not in that list of local gems.</p> <p>When I try the command </p> <pre><code> which rails </code></pre> <p>I get: </p> <pre><code>/usr/bin/rails </code></pre> <p>So then that kind of makes me think that rails is in there somewhere. But when I try:</p> <pre><code> $ rails -v </code></pre> <p>I get:</p> <pre><code>Rails is not currently installed on this system. To get the latest version, simply type: $ sudo gem install rails You can then rerun your "rails" command. </code></pre> <p><strong>I wonder whether this happens because I did things in the wrong order?</strong></p> <p>I first updated gems and then I installed XCODE and changed the .bash_profile to the following - and I think I should have done this before updating gems. </p> <pre><code>PS1="\u$ " alias ll="ls -laGH" export PATH="/usr/local/bin:/usr/local/sbin:/usr/local/mysql/bin:$PATH" </code></pre> <p>I think I should have done the .bash_profile path before updating gems and I should also have installed xcode first, but I was unsure of the order of doing things.</p> <p>Please help a true newbie to ruby as I can't start learning before I have a working environment....</p>
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    1. USPixie
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    1. COHere are a couple of posts that may help: http://stackoverflow.com/questions/7454361/rubygems-do-not-install-on-os-x-lion --and-- http://nearthespeedoflight.com/article/how_to_fix__mkmf.rb_can_t_find_header_files_for_ruby__on_mac_os_x_lion
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    2. COIt doesn't make sense that you have `rails` in `/usr/bin/rails` after installing it with gem. You should find the correct executable in `GEM_PATH/rails-.../bin`.
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    3. COYes, and the core problem is that you're missing ruby headers. What ruby package/bundle did you install?
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