From: Ryan Davis <ryand-ruby@...>
Date: 2010-09-15T16:30:00+09:00
Subject: Re: Errors while updating gems...


On Sep 14, 2010, at 22:27 , Eric R. wrote:

> I'm new to Ruby, so please forgive me if this seems a tad bit obvious :)
> 
> While updating my gems so I could get Rails 3.0, I got many of the
> following errors (as in this example, it's sqlite):
> 
> Updating sqlite3-ruby
> Building native extensions.  This could take a while...
> ERROR:  Error installing sqlite3-ruby:
>  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

Quick preliminary: do you have apple's developer tools installed? They come free with your machine ... usually on the Extras DVD. You can also download it (big 1 gig download) for free from developer.apple.com.