Failed chef install

gistfile1.txt

pdxsmitht02:~ smitht$ cd /tmp
pdxsmitht02:tmp smitht$ curl -O http://production.cf.rubygems.org/rubygems/rubygems-1.8.10.tgz
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100  243k  100  243k    0     0   893k      0 --:--:-- --:--:-- --:--:-- 1207k
pdxsmitht02:tmp smitht$ tar zxf rubygems-1.8.10.tgz
pdxsmitht02:tmp smitht$ cd rubygems-1.8.10
pdxsmitht02:rubygems-1.8.10 smitht$ sudo ruby setup.rb --no-format-executable
Password:
RubyGems 1.8.10 installed


== 1.8.10 / 2011-08-25

RubyGems 1.8.10 contains a security fix that prevents malicious gems from
executing code when their specification is loaded.  See
https://github.com/rubygems/rubygems/pull/165 for details.

* 5 bug fixes:

  * RubyGems escapes strings in ruby-format specs using #dump instead of #to_s
    and %q to prevent code injection.  Issue #165 by Postmodern
  * RubyGems attempt to activate the psych gem now to obtain bugfixes from
    psych.
  * Gem.dir has been restored to the front of Gem.path.  Fixes remaining
    problem with Issue #115
  * Fixed Syck DefaultKey infecting ruby-format specifications.
  * `gem uninstall a b` no longer stops if gem "a" is not installed.


------------------------------------------------------------------------------

RubyGems installed the following executables:
	/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/bin/gem

pdxsmitht02:rubygems-1.8.10 smitht$ 
pdxsmitht02:rubygems-1.8.10 smitht$ 
pdxsmitht02:rubygems-1.8.10 smitht$ sudo gem install chef --no-ri --no-rdoc
Fetching: mixlib-config-1.1.2.gem (100%)
Fetching: mixlib-cli-1.2.2.gem (100%)
Fetching: mixlib-log-1.3.0.gem (100%)
Fetching: mixlib-authentication-1.1.4.gem (100%)
Fetching: mixlib-shellout-1.0.0.rc.1.gem (100%)
Fetching: systemu-2.5.1.gem (100%)
Fetching: yajl-ruby-1.1.0.gem (100%)
Building native extensions.  This could take a while...
ERROR:  Error installing chef:
	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/yajl-ruby-1.1.0 for inspection.
Results logged to /Library/Ruby/Gems/1.8/gems/yajl-ruby-1.1.0/ext/yajl/gem_make.out