Rails：安装 ruby​​racer 时出错

Question

我正在我的 linode 服务器上运行“捆绑安装”。但无法安装 ruby​​racer 的原因。捆绑安装输出为：

Installing therubyracer (0.11.0) 
Gem::Installer::ExtensionBuildError: ERROR: Failed to build gem native extension.

    /usr/local/bin/ruby extconf.rb 
checking for main() in -lpthread... yes
*** 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=/usr/local/bin/ruby
--with-pthreadlib
--without-pthreadlib
--enable-debug
--disable-debug
/usr/local/lib/ruby/gems/1.9.1/gems/therubyracer-0.11.0/ext/v8/build.rb:50:in `build_with_rubygem_libv8': undefined local variable or method `libv8_include_flags' for main:Object (NameError)
from extconf.rb:20:in `<main>'


Gem files will remain installed in /usr/local/lib/ruby/gems/1.9.1/gems/therubyracer-0.11.0 for inspection.
Results logged to /usr/local/lib/ruby/gems/1.9.1/gems/therubyracer-0.11.0/ext/v8/gem_make.out

An error occurred while installing therubyracer (0.11.0), and Bundler cannot continue.
Make sure that `gem install therubyracer -v '0.11.0'` succeeds before bundling.

实际上安装了 gem ruby​​racer 但版本是 0.11.4。我只是不知道为什么它不采用这个版本并且只接受 0.11.0。

还有如何安装 0.11.0。当我运行错误“gem install therubyracer -v '0.11.0'”中给出的命令时，它无法执行并给出：

Building native extensions.  This could take a while...
ERROR:  Error installing therubyracer:
ERROR: Failed to build gem native extension.

    /usr/local/bin/ruby extconf.rb
checking for main() in -lpthread... yes
*** 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=/usr/local/bin/ruby
--with-pthreadlib
--without-pthreadlib
--enable-debug
--disable-debug
/usr/local/lib/ruby/gems/1.9.1/gems/therubyracer-0.11.0/ext/v8/build.rb:50:in    `build_with_rubygem_libv8': undefined local variable or method `libv8_include_flags' for    main:Object (NameError)
from extconf.rb:20:in `<main>'


Gem files will remain installed in /usr/local/lib/ruby/gems/1.9.1/gems/therubyracer-    0.11.0 for inspection.
Results logged to /usr/local/lib/ruby/gems/1.9.1/gems/therubyracer-0.11.0/ext/v8/gem_make.out

这里有人可以帮忙吗？在堆栈和 git 上搜索了很多，但没有一个给定的解决方案有效。

我的宝石文件：

source 'https://rubygems.org'

gem 'rails', '3.2.12'
gem "paperclip"
gem 'mysql2'
gem "devise"
group :assets do
 gem 'sass-rails',   '~> 3.2.3'
 gem 'coffee-rails', '~> 3.2.1'

gem 'uglifier', '>= 1.0.3'
end


gem 'jquery-rails'
gem 'libv8', '3.11.8.4', :platform => :ruby
gem 'therubyracer', '0.11.0', :platforms => :ruby
gem 'rails_admin'
gem 'unicorn'
gem 'delayed_job_active_record'
gem 'daemons'

Answer 1

我在ubuntu上也遇到同样的问题：

经过一些实验，我能够确认gem install therubyracer --pre命令行上的“”工作正常，但告诉捆绑程序使用该--pre选项不起作用：

bundle config build.therubyracer --pre

我不知道这是否是因为 gem 是通过依赖项而不是 Gemfile 中显式的“gem”行引入的。即使经过大量的谷歌搜索，我也无法解决这个问题，但由于 0.11 似乎只有几个小时的历史，我决定尝试0.10通过添加以下内容来恢复到以前的版本：

gem 'therubyracer', '=0.10'

在使用依赖于它的 gem 之前。这迫使捆绑程序选择早期版本，并且它安装得非常顺利。希望someone will fix 0.11尽快。

在 github 上查看 therubyracer 的问题后，这似乎与两个不同的问题有关 - 一个已关闭： https: //github.com/cowboyd/therubyracer/issues/213，建议首先（或显式）安装 libv8 gem，以及这会导致不同的错误：https://github.com/cowboyd/therubyracer/issues/215，并且尚未关闭 - libv8 gem 似乎有一个针对 64 位目标的损坏的二进制文件。唯一的解决方案似乎是从源代码构建 libv8 或像我一样并备份到 0.11beta8 或更早版本（有人说0.11beta8可行）。在此之前，我建议您查看 Github 上的 215 问题并等待修复。

谢谢。