ruby-on-rails - 无法安装 rails 3.2.9 : Failed to build gem native extension

Question

我just cleaned rvm 和 ruby​​ 并重新安装它。我正在尝试安装 Rails，但出现此错误:

gem install rails -v 3.2.9

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

        /usr/bin/ruby1.9.1 extconf.rb
/usr/lib/ruby/1.9.1/rubygems/custom_require.rb:36:in `require': cannot load such file -- mkmf (LoadError)
    from /usr/lib/ruby/1.9.1/rubygems/custom_require.rb:36:in `require'
    from extconf.rb:1:in `<main>'


Gem files will remain installed in /var/lib/gems/1.9.1/gems/json-1.8.1 for inspection.
Results logged to /var/lib/gems/1.9.1/gems/json-1.8.1/ext/json/ext/generator/gem_make.out

如果我用我的 Gemfile 运行 bundle install，它有 rails 3.2.9 和一些更多的 gem，我会得到这个错误:

An error occurred while installing json (1.8.1), and Bundler cannot continue.
Make sure that `gem install json -v '1.8.1'` succeeds before bundling.

猜猜看。运行建议的命令给我另一个错误:

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

        /usr/bin/ruby1.9.1 extconf.rb
/usr/lib/ruby/1.9.1/rubygems/custom_require.rb:36:in `require': cannot load such file -- mkmf (LoadError)
    from /usr/lib/ruby/1.9.1/rubygems/custom_require.rb:36:in `require'
    from extconf.rb:1:in `<main>'


Gem files will remain installed in /var/lib/gems/1.9.1/gems/json-1.8.1 for inspection.
Results logged to /var/lib/gems/1.9.1/gems/json-1.8.1/ext/json/ext/generator/gem_make.out

Answer 1

可能重复:

• Unable to install gem - Failed to build gem native extension - cannot load such file -- mkmf (LoadError)
• `require': no such file to load -- mkmf (LoadError)

---

根据您的 ruby​​ 版本，运行:

sudo apt-get install ruby1.9.1-dev