我做了一个 Rails 项目，
rails new test_bootstrap.
成功了。
移动到项目目录并添加宝石
gem "therubyracer"
gem "less-rails" #Sprockets (what Rails 3.1 uses for its asset pipeline) supports LESS
gem "twitter-bootstrap-rails"
and run
bundle install
之后，我有这个错误。
Installing libv8 (3.16.14.3)
Gem::Installer::ExtensionBuildError: ERROR: Failed to build gem native extension.
c:/RailsInstaller/Ruby1.9.3/bin/ruby.exe extconf.rb
creating Makefile
지정된 경로를 찾을 수 없습니다. 지정된 경로를 찾을 수
없습니다. 지정된 경로를 찾을 수 없습니다.
c:/RailsInstaller/Ruby1.9.3/lib/ruby/ge
ms/1.9.1/gems/libv8-3.16.14.3/ext/libv8/builder.rb:58:in `setup_python!': libv8 requires
python 2 to be installed in order to build, but it is currently not available (RuntimeErr
or) from c:/RailsInstaller/Ruby1.9.
3/lib/ruby/gems/1.9.1/gems/libv8-3.16.14.3/ext/libv8/builder.rb:42:in `block in build_lib
v8/builder.rb:42:in `block in build_libv8!'
from c:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/libv8-3.16.14.3/ext/lib
v8/builder.rb:40:in `chdir'
from c:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/libv8-3.16.14.3/ext/lib
v8/builder.rb:40:in `build_libv8!'
from c:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/libv8-3.16.14.3/ext/lib
v8/location.rb:24:in `install!'
from extconf.rb:7:in `<main>'
Gem files will remain installed in c:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/l
ibv8-3.16.14.3 for inspection.
Results logged to c:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/libv8-3.16.14.3/ex
t/libv8/gem_make.out
An error occurred while installing libv8 (3.16.14.3), and Bundler cannot
continue.
Make sure that `gem install libv8 -v '3.16.14.3'` succeeds before bundling.
为一些韩国人感到遗憾。它说，它找不到所选的路径或类似的东西。
我尝试运行这个命令
gem install libv8 -v '3.16.14.3'
抛出同样的错误。
试试这个：
gem install libv8 -v '3.16.14.3' -- --with-system-v8
Note :因为libv8是therubyracer使用的V8引擎的接口，
即使您已经安装了 V8，您也可能需要使用 libv8。如果
您希望使用自己的 V8 安装，而不是构建它
对于您来说，请使用--with-system-v8 option.
有关更多信息，您可以浏览以下文档github 上的 libv8
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