> Hi I'm having the same problem, latest copy of xcode, dev tools and snow 
> leopard but I cant get some of the gems to build. It seems like gem 
> can't find the header files for Ruby...Any ideas?
> 
> 
> Installing ri documentation for diff-lcs-1.1.2...
> Installing RDoc documentation for diff-lcs-1.1.2...
> Building native extensions.  This could take a while...
> ERROR:  Error installing dnssd:
>   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/dnssd-0.7.1 for inspection.
> Results logged to 
> /Library/Ruby/Gems/1.8/gems/dnssd-0.7.1/ext/gem_make.out
> Successfully installed echoe-3.1.1

Well, you can install other Ruby. I followed this tutorial and it worked 
great:

http://www.dcmanges.com/blog/install-multiple-versions-of-ruby-on-osx-leopard

The problem with header files were gone. But the problem with 
openssh.bundle I couldn't solve.
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