Ruby-on-rails 安装 libv8 时出错：错误：无法构建 gem 本机扩展
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Error installing libv8: ERROR: Failed to build gem native extension
提问by Canna
I made a rails project with,
我做了一个 Rails 项目，
rails new test_bootstrap.
succeeded.
成功了。
moved to the project dir and added the gems
移动到项目目录并添加了 gems
gem "therubyracer"
gem "less-rails" #Sprockets (what Rails 3.1 uses for its asset pipeline) supports LESS
gem "twitter-bootstrap-rails"
and run
并运行
bundle install
after that, i have this error.
在那之后，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
??? ??? ?? ? ????. ??? ??? ?? ?
????. ??? ??? ?? ? ????.
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.
sorry for some Koreans. It says, It can't find the chosen path or something like that.
对不起一些韩国人。它说，它找不到选择的路径或类似的东西。
and i tried to run this command
我试着运行这个命令
gem install libv8 -v '3.16.14.3'
throwing the same error.
抛出同样的错误。
回答by Gopal S Rathore
try this one:
试试这个：
gem install libv8 -v '3.16.14.3' -- --with-system-v8
Note :Because libv8 is the interface for the V8 engine used by therubyracer, you may need to use libv8, even if you have V8 installed already. If you wish to use your own V8 installation, rather than have it built for you, use the
--with-system-v8option.
注意：因为 libv8 是 therubyracer 使用的 V8 引擎的接口，所以您可能需要使用 libv8，即使您已经安装了 V8。如果您希望使用自己的 V8 安装，而不是为您构建它，请使用该
--with-system-v8选项。
For more you can go through the documentation of libv8 on github
有关更多信息，您可以查看 github 上的libv8文档
回答by Arpit Shah
How to resolve libv8/therubyracer issue
如何解决 libv8/therubyracer 问题
I encountered similar issue in which after installing libv8, error occurs installing therubyracer. Here is my solution:
我遇到了类似的问题，在安装 libv8 后，安装 therubyracer 时发生错误。这是我的解决方案：
$ gem install libv8 -v '3.16.14.3' -- --with-system-v8
$ bundle install
-- see error installing therubyracer --
-- 查看安装 therubyracer 时出错 --
$ gem uninstall libv8
$ brew install v8
$ gem install therubyracer
$ bundle install
-- see error installing libv8 --
-- 请参阅安装 libv8 时出错 --
$ gem install libv8 -v '3.16.14.3' -- --with-system-v8
回答by coding addicted
With homebrew this helps me to solve this error.
使用自制软件，这有助于我解决此错误。
brew tap homebrew/versions
brew install v8-315
gem install libv8 -v '3.16.14.13' -- --with-system-v8
gem install therubyracer -- --with-v8-dir=/usr/local/opt/v8-315
bundle install
Seen on rubyracer Github issues.
见于 rubyracer Github 问题。
回答by Anand Chavan
I tried the solution listed above command which looks very fine for installing individual gem, but for bundler users - you should use bundle config
我尝试了上面列出的命令的解决方案，它对于安装单个 gem 看起来非常好，但对于捆绑用户 - 你应该使用捆绑配置
Use
用
bundle config build.libv8 --with-system-v8
and
和
bundle config build.therubyracer --with-system-v8
to configure bundler to take the parameters to be used while installing specific gem
配置 bundler 以获取安装特定 gem 时要使用的参数
回答by Litmus
I do not think you need therubyracergem on windows. It is a javascript runtime using V8 engine. Hence it is making an attempt to install libv8.
我认为您不需要therubyracer在 Windows 上使用 gem。它是一个使用 V8 引擎的 javascript 运行时。因此，它正在尝试安装libv8.
You can safely remove the gem from your Gemfile.
您可以安全地从 Gemfile 中删除 gem。
Rails is happy to use which ever runtime it can find. execjs,nodejsetc. are all possible options.
Rails 很乐意使用它可以找到的任何运行时。execjs，nodejs等等都是可能的选择。
Microsoft already embeds JScript runtime for javascript on windows, and Rails uses it. See this for more
Microsoft 已经在 Windows 上为 javascript 嵌入了 JScript 运行时，Rails 使用它。查看更多
回答by Arman Ortega
Other workaround to fix the problem is to separate them in the Gemfile
解决问题的其他解决方法是在 Gemfile 中将它们分开
group :production do
gem 'libv8', '~> 3.11.8.3'
gem 'therubyracer', :platform => :ruby
end
And then run the bundle command: bundle install --without production
然后运行 bundle 命令：bundle install --without production
回答by Rishav Bhardwaj
I was also unable to install this gem instead of using
我也无法安装这个 gem 而不是使用
--with-system-v8
once try to do bundle updatewhich worked fine for me
曾经尝试进行捆绑更新，这对我来说很好用
回答by Sojan V Jose
回答by Hrk
That works for me. Put that in your Gemfile
这对我行得通。把它放在你的 Gemfile 中
gem 'libv8', '~>3.16.14.7'
宝石“libv8”，“~>3.16.14.7”
回答by d1jhoni1b
My issue wasn't related with therubyracerat all just libv8gem and as @rishav-bhardwaj pointed --with-system-v8didn't do the trick, instead i had to exec
我的问题尚未有相关therubyracer的一切只是libv8宝石和指出@ rishav-巴德瓦杰--with-system-v8没有做的伎俩，而不是我不得不EXEC
bundle update
bundle update
then
然后
bundle install
bundle install
and finally
最后
Bundle complete!
Bundle complete!
The error is gone!
错误消失了！
Gem::Ext::BuildError: ERROR: Failed to build gem native extension.
An error occurred while installing libv8 (3.16.14.7), and Bundler cannot continue.
Make sure that `gem install libv8 -v '3.16.14.7'` succeeds before bundling.
Gem::Ext::BuildError: ERROR: Failed to build gem native extension.
An error occurred while installing libv8 (3.16.14.7), and Bundler cannot continue.
Make sure that `gem install libv8 -v '3.16.14.7'` succeeds before bundling.
