安装OSX Mavericks 10.9演示版后，我在运行包后得到了这个
Gem::Installer::ExtensionBuildError: ERROR: Failed to build gem native extension.
/Users/sandric/.rvm/rubies/ruby-1.9.3-p194/bin/ruby extconf.rb
extconf.rb:17: Use RbConfig instead of obsolete and deprecated Config.
checking for socket() in -lsocket... *** 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/sandric/.rvm/rubies/ruby-1.9.3-p194/bin/ruby
--with-iconv-dir
--without-iconv-dir
--with-iconv-include
--without-iconv-include=${iconv-dir}/include
--with-iconv-lib
--without-iconv-lib=${iconv-dir}/lib
--with-zlib-dir
--without-zlib-dir
--with-zlib-include
--without-zlib-include=${zlib-dir}/include
--with-zlib-lib
--without-zlib-lib=${zlib-dir}/lib
--with-socketlib
--without-socketlib
/Users/sandric/.rvm/rubies/ruby-1.9.3-p194/lib/ruby/1.9.1/mkmf.rb:381:in `try_do': The compiler failed to generate an executable file. (RuntimeError)
You have to install development tools first.
from /Users/sandric/.rvm/rubies/ruby-1.9.3-p194/lib/ruby/1.9.1/mkmf.rb:461:in `try_link0'
from /Users/sandric/.rvm/rubies/ruby-1.9.3-p194/lib/ruby/1.9.1/mkmf.rb:476:in `try_link'
from /Users/sandric/.rvm/rubies/ruby-1.9.3-p194/lib/ruby/1.9.1/mkmf.rb:619:in `try_func'
from /Users/sandric/.rvm/rubies/ruby-1.9.3-p194/lib/ruby/1.9.1/mkmf.rb:845:in `block in have_library'
from /Users/sandric/.rvm/rubies/ruby-1.9.3-p194/lib/ruby/1.9.1/mkmf.rb:790:in `block in checking_for'
from /Users/sandric/.rvm/rubies/ruby-1.9.3-p194/lib/ruby/1.9.1/mkmf.rb:284:in `block (2 levels) in postpone'
from /Users/sandric/.rvm/rubies/ruby-1.9.3-p194/lib/ruby/1.9.1/mkmf.rb:254:in `open'
from /Users/sandric/.rvm/rubies/ruby-1.9.3-p194/lib/ruby/1.9.1/mkmf.rb:284:in `block in postpone'
from /Users/sandric/.rvm/rubies/ruby-1.9.3-p194/lib/ruby/1.9.1/mkmf.rb:254:in `open'
from /Users/sandric/.rvm/rubies/ruby-1.9.3-p194/lib/ruby/1.9.1/mkmf.rb:280:in `postpone'
from /Users/sandric/.rvm/rubies/ruby-1.9.3-p194/lib/ruby/1.9.1/mkmf.rb:789:in `checking_for'
from /Users/sandric/.rvm/rubies/ruby-1.9.3-p194/lib/ruby/1.9.1/mkmf.rb:840:in `have_library'
from extconf.rb:27:in `<main>'
Gem files will remain installed in /Users/sandric/.bundler/tmp/5282/gems/libxml-ruby-2.6.0 for inspection.
Results logged to /Users/sandric/.bundler/tmp/5282/gems/libxml-ruby-2.6.0/ext/libxml/gem_make.out
An error occurred while installing libxml-ruby (2.6.0), and Bundler cannot continue.
Make sure that `gem install libxml-ruby -v '2.6.0'` succeeds before bundling.
我想我没有命令行工具，所以我试着下载了一些.它发现在我的XCode中没有常见的链接(它是4，不是5，不知道为什么.如果有办法安装第五个XCode，请帮助).所以我go 了apple开发者的网页，没有找到10.9的命令行工具.我try 了10.8版本，它会打印"Try install for 10.7"，在try 了10.7版本的工具之后，它会打印"Try for 10.8".
请帮帮我.我会提供所有信息以寻求帮助.