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POhas anyone tried installing ruby & rubygems from source on ubuntu (preferably unbuntu 9)?
 

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  1. POhas anyone tried installing ruby & rubygems from source on ubuntu (preferably unbuntu 9)?
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    <p>The Ruby on Rails website recommends installing Ruby from source under Linux. I encountered a number of C library problems building ruby from source on a clean install of Unbuntu 9.</p> <p>All the instructions I found on the net about installing ruby on ubuntu have involved using the prepackaged (.deb-based) ruby. Clearly this isn't what the rails people recommend.</p> <p>When I did a clean source build of ruby I found Rubygems failed to install because the zlib extension didn't work.</p> <p>Two problems occur:</p> <p>1) The zlib extension isn't built.</p> <p>Solution:</p> <p>i) ensure zlib is uncommented in the Setup file within the extn directory of the ruby source, and</p> <p>ii) ensure these zlib ubuntu packages are installed:</p> <pre><code>aptitude install zlib1g aptitude install zlib1g-dbg aptitude install zlib1g-dev aptitude install zlibc </code></pre> <p>2) After fixing Problem 1 above (and doing a clean rebuild of ruby), zlib still doesn't work because the extension fails to load. </p> <p>You can see that the module fails to load by running this and getting the output "false":</p> <pre><code>puts require 'zlib' </code></pre> <p>I observed this happens to any number of other C extensions in the extn directory, so it appears to be a more general problem with these extensions than just something zlib-specific.</p> <p>To summarise:</p> <ul> <li>My build of ruby finds the ruby-specific C zlib extension but it fails to load the zlib module.</li> <li>This behaviour appears to happen to other extensions in /extn.</li> </ul> <p>Is there a way I can find out why a module fails to load? some kind of trace/verbose mode?</p>
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    1. COpossible duplicate of [Why would yaml be unavailable in production?](http://stackoverflow.com/questions/1793693/why-would-yaml-be-unavailable-in-production)
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      1. POhas anyone tried installing ruby & rubygems from source on ubuntu (preferably unbuntu 9)?
      1. USAndrew Grimm
    2. COActually, the other question is the duplicate, this is the original. Nevermind. Anyway, since this is a common misunderstanding, I've asked for the RDoc of `require` to explain what `false` means: http://redmine.ruby-lang.org/issues/5210
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