I couldn't install nokogiri on Mavericks.

nokogiri.log

Fetching: mini_portile-0.5.2.gem (100%)
Successfully installed mini_portile-0.5.2
Fetching: nokogiri-1.6.0.gem (100%)
Building native extensions.  This could take a while...
ERROR:  Error installing nokogiri:
        ERROR: Failed to build gem native extension.

    /Users/katsu/.rbenv/versions/2.0.0-p247/bin/ruby extconf.rb
Extracting libxml2-2.8.0.tar.gz into tmp/x86_64-apple-darwin13.0.0/ports/libxml2/2.8.0... OK
Running 'configure' for libxml2 2.8.0... OK
Running 'compile' for libxml2 2.8.0... OK
Running 'install' for libxml2 2.8.0... OK
Activating libxml2 2.8.0 (from /Users/katsu/.rbenv/versions/2.0.0-p247/lib/ruby/gems/2.0.0/gems/nokogiri-1.6.0/ports/x86_64-apple-darwin13.0.0/libxml2/2.8.0)...
Extracting libxslt-1.1.26.tar.gz into tmp/x86_64-apple-darwin13.0.0/ports/libxslt/1.1.26... OK
Running 'configure' for libxslt 1.1.26... ERROR, review 'tmp/x86_64-apple-darwin13.0.0/ports/libxslt/1.1.26/configure.log' to see what happened.
*** extconf.rb failed ***
Could not create Makefile due to some reason, probably lack of necessary
libraries and/or headers.  Check the mkmf.log file for more details.  You may
need configuration options.

Provided configuration options:
        --with-opt-dir
        --without-opt-dir
        --with-opt-include
        --without-opt-include=${opt-dir}/include
        --with-opt-lib
        --without-opt-lib=${opt-dir}/lib
        --with-make-prog
        --without-make-prog
        --srcdir=.
        --curdir
        --ruby=/Users/katsu/.rbenv/versions/2.0.0-p247/bin/ruby
/Users/katsu/.rbenv/versions/2.0.0-p247/lib/ruby/gems/2.0.0/gems/mini_portile-0.5.2/lib/mini_portile.rb:265:in `block in execute': Failed to complete configure task (RuntimeError)
        from /Users/katsu/.rbenv/versions/2.0.0-p247/lib/ruby/gems/2.0.0/gems/mini_portile-0.5.2/lib/mini_portile.rb:257:in `chdir'
        from /Users/katsu/.rbenv/versions/2.0.0-p247/lib/ruby/gems/2.0.0/gems/mini_portile-0.5.2/lib/mini_portile.rb:257:in `execute'
        from /Users/katsu/.rbenv/versions/2.0.0-p247/lib/ruby/gems/2.0.0/gems/mini_portile-0.5.2/lib/mini_portile.rb:65:in `configure'
        from /Users/katsu/.rbenv/versions/2.0.0-p247/lib/ruby/gems/2.0.0/gems/mini_portile-0.5.2/lib/mini_portile.rb:108:in `cook'
        from extconf.rb:101:in `block in <main>'
        from extconf.rb:131:in `call'
        from extconf.rb:131:in `block in <main>'
        from extconf.rb:122:in `tap'
        from extconf.rb:122:in `<main>'


Gem files will remain installed in /Users/katsu/.rbenv/versions/2.0.0-p247/lib/ruby/gems/2.0.0/gems/nokogiri-1.6.0 for inspection.
Results logged to /Users/katsu/.rbenv/versions/2.0.0-p247/lib/ruby/gems/2.0.0/gems/nokogiri-1.6.0/ext/nokogiri/gem_make.out
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