From: Eric Christopherson <echristopherson@...>
Date: 2010-03-12T07:21:21+09:00
Subject: Re: Can't install gems with native extensions

On Thu, Mar 11, 2010 at 1:50 PM, Nikita Vasilyev <me@elv1s.ru> wrote:
> ➤ gem install rdiscount
> Building native extensions.  This could take a while...
> ERROR:  Error installing rdiscount:
>  ERROR: Failed to build gem native extension.
>
> /usr/local/bin/ruby extconf.rb
> WARNING: JRuby does not support native extensions or the `mkmf' library.
>         Check wiki.jruby.org for alternatives.
> extconf.rb:3: undefined method `dir_config' for main:Object
> (NoMethodError)
>
>
> Gem files will remain installed in
> /usr/local/lib/ruby/gems/1.8/gems/rdiscount-1.6.3 for inspection.
> Results logged to
> /usr/local/lib/ruby/gems/1.8/gems/rdiscount-1.6.3/ext/gem_make.out
>
>
>
> I've the same problem with RedCloth.
> I don't even use jruby.
>
> ➤ ruby --version
> ruby 1.8.7 (2009-06-12 patchlevel 174) [i686-darwin9.7.0]

Is it possible you have Jruby installed anyway? It sounds like Jruby's
version of gem is running. Try `which gem` or `gem env` to find out.
If it is Jruby's gem, try putting MRI ahead of it in your $PATH.