mysql - 在 Ubuntu 14 上安装 mysql2 gem 失败

Question

我正在运行 Ubuntu 14，当我尝试运行 rails server 但出现此错误时:

Could not find gem 'mysql2 (>= 0) ruby' in the gems available on this machine. Run bundle install to install missing gems.

因此，我运行bundle install，然后收到以下错误。

Gem::Ext::BuildError: ERROR: Failed to build gem native extension.

    /usr/bin/ruby2.1 extconf.rb 
mkmf.rb can't find header files for ruby at /usr/lib/ruby/include/ruby.h

extconf failed, exit code 1

Gem files will remain installed in /var/lib/gems/2.1.0/gems/mysql2-0.3.16 for inspection.
Results logged to /var/lib/gems/2.1.0/extensions/x86_64-linux/2.1.0/mysql2-0.3.16/gem_make.out
An error occurred while installing mysql2 (0.3.16), and Bundler cannot continue.
Make sure that `gem install mysql2 -v '0.3.16'` succeeds before bundling.

所以我运行gem install mysql2 -v '0.3.16'并且它安装成功，但是当我再次运行bundle install时它给了我同样的错误:

Gem::Ext::BuildError: ERROR: Failed to build gem native extension.

    /usr/bin/ruby2.1 extconf.rb 
mkmf.rb can't find header files for ruby at /usr/lib/ruby/include/ruby.h

extconf failed, exit code 1

Gem files will remain installed in /var/lib/gems/2.1.0/gems/mysql2-0.3.16 for inspection.
Results logged to /var/lib/gems/2.1.0/extensions/x86_64-linux/2.1.0/mysql2-0.3.16/gem_make.out
An error occurred while installing mysql2 (0.3.16), and Bundler cannot continue.
Make sure that `gem install mysql2 -v '0.3.16'` succeeds before bundling.

Answer 1

从头开始，这次您应该安装 RVM，因为它非常擅长为您处理所有这些事情。 http://rvm.io/rvm/install

确保您首先获得所有依赖项，此代码将检查您拥有和没有的依赖项:

for name in {bash,awk,sed,grep,ls,cp,tar,curl,gunzip,bunzip2,git,svn} ; do which $name ;  done

还值得查看先决条件页面:http://rvm.io/rvm/prerequisites

您可以运行以下代码来使用 Ruby 2.1.1 和 Rails 安装 rvm:

\curl -sSL https://get.rvm.io | bash -s stable --rails

然后开始使用 RVM:

/bin/bash --login

使用 RVM 绝对值得，它会让您在管理 ruby​​ 版本、gems 等时变得更加轻松，只需确保您通读网页，以便知道如何使用它。