Question

我正在尝试使用Ruby Version Manager在Ubuntu 12.10上安装Rails。我相信Ruby和RubyGems安装正确，这些是我的版本：

ruby -v: ruby 1.9.3p194 (2012-04-20 revision 35410) [x86_64-linux]
gem -v: 1.8.23

我正在尝试使用

安装rails

sudo gem install rails -v 3.2.9

这会获取大量宝石，但在构建原生扩展时遇到问题：

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-1.7.5 for inspection.
Results logged to /var/lib/gems/1.9.1/gems/json-1.7.5/ext/json/ext/generator/gem_make.out

知道我做错了什么吗？如果有帮助，我正在尝试按照http://ruby.railstutorial.org/ruby-on-rails-tutorial-book#sec-install_rails上的教程。

谢谢！

Answer 1

您是否安装了C编译器？如果没有，您应该运行sudo apt-get install build-essential来设置编译器工具链

Answer 2

以普通用户身份安装gem，而不是sudo：

gem install rails

或者安装ruby dev包。 SO中有很多类似的答案：

Failed to build gem native extension — Rails install

Unable to install gem - Failed to build gem native extension - cannot load such file -- mkmf (LoadError)

试图安装Rails，无法构建Gem Native Extension

2 个答案: