我花了过去几个小时，除了搜索 Stack Overflow 之外，试图找到解决这个问题的方法，但是在运行bundle install.
这是错误消息：
Alexander-MacBook-Pro:HealthApp Alex$ bundle install
Fetching gem metadata from https://rubygems.org/........
Fetching gem metadata from https://rubygems.org/..
Resolving dependencies......
Using rake (10.0.3)
Using i18n (0.6.4)
Using multi_json (1.6.1)
Using activesupport (3.2.11)
Using builder (3.0.4)
Using activemodel (3.2.11)
Using erubis (2.7.0)
Using journey (1.0.4)
Using rack (1.4.5)
Using rack-cache (1.2)
Using rack-test (0.6.2)
Using hike (1.2.1)
Using tilt (1.3.4)
Using sprockets (2.2.2)
Using actionpack (3.2.11)
Using mime-types (1.21)
Using polyglot (0.3.3)
Using treetop (1.4.12)
Using mail (2.4.4)
Using actionmailer (3.2.11)
Using arel (3.0.2)
Using tzinfo (0.3.36)
Using activerecord (3.2.11)
Using activeresource (3.2.11)
Using bcrypt-ruby (3.0.1)
Using sass (3.2.6)
Using bootstrap-sass (2.3.0.1)
Using bundler (1.3.5)
Using cancan (1.6.9)
Using coffee-script-source (1.6.0)
Using execjs (1.4.0)
Using coffee-script (2.2.0)
Using rack-ssl (1.3.3)
Using json (1.7.7)
Using rdoc (3.12.2)
Using thor (0.17.0)
Using railties (3.2.11)
Using coffee-rails (3.2.2)
Using commonjs (0.2.6)
Using orm_adapter (0.4.0)
Using warden (1.2.1)
Using devise (2.2.3)
Using sass-rails (3.2.6)
Using font-awesome-sass-rails (3.0.2.2)
Using haml (4.0.0)
Using jquery-rails (2.2.1)
Using jquery-ui-rails (3.0.1)
Using kaminari (0.14.1)
Using less (2.2.2)
Using less-rails (2.2.6)
Installing libv8 (3.11.8.13)
Gem::Installer::ExtensionBuildError: ERROR: Failed to build gem native extension.
/Users/Alex/.rvm/rubies/jruby-1.7.4/bin/jruby extconf.rb
NotImplementedError: C extension support is not enabled. Pass -Xcext.enabled=true to JRuby or set JRUBY_OPTS or modify .jrubyrc to enable.
(root) at /Users/Alex/.rvm/rubies/jruby-1.7.4/lib/ruby/shared/mkmf.rb:8
require at org/jruby/RubyKernel.java:1054
(root) at /Users/Alex/.rvm/rubies/jruby-1.7.4/lib/ruby/shared/rubygems/core_ext/kernel_require.rb:1
(root) at extconf.rb:1
Gem files will remain installed in /Users/Alex/.rvm/gems/jruby-1.7.4/gems/libv8-3.11.8.13 for inspection.
Results logged to /Users/Alex/.rvm/gems/jruby-1.7.4/gems/libv8-3.11.8.13/ext/libv8/gem_make.out
An error occurred while installing libv8 (3.11.8.13), and Bundler cannot
continue.
Make sure that `gem install libv8 -v '3.11.8.13'` succeeds before bundling.
跑步gem install libv8 -v '3.11.8.13'没有多大帮助。