Ruby gems 路径问题（系统与 brew）

Question

当系统 gems 不在 $PATH 中时，我在寻找系统 gems 时遇到问题。

这是我的 gem env 显示我的 gem 安装在我的 .rvm/gems 目录中：

    RubyGems Environment:
  - RUBYGEMS VERSION: 2.4.5
  - RUBY VERSION: 2.2.2 (2015-04-13 patchlevel 95) [x86_64-darwin14]
  - INSTALLATION DIRECTORY: /Users/scott/.rvm/gems/ruby-2.2.2
  - RUBY EXECUTABLE: /usr/local/opt/ruby/bin/ruby
  - EXECUTABLE DIRECTORY: /Users/scott/.rvm/gems/ruby-2.2.2/bin
  - SPEC CACHE DIRECTORY: /Users/scott/.gem/specs
  - SYSTEM CONFIGURATION DIRECTORY: /usr/local/Cellar/ruby/2.2.2/etc
  - RUBYGEMS PLATFORMS:
    - ruby
    - x86_64-darwin-14
  - GEM PATHS:
     - /Users/scott/.rvm/gems/ruby-2.2.2
     - /Users/scott/.rvm/gems/ruby-2.2.2@global
  - GEM CONFIGURATION:
     - :update_sources => true
     - :verbose => true
     - :backtrace => false
     - :bulk_threshold => 1000
     - :sources => ["http://gems.rubyforge.org/", "http://gems.github.com"]
     - :benchmark => false
     - "gem" => "--no-ri --no-rdoc"
  - REMOTE SOURCES:
     - http://gems.rubyforge.org/
     - http://gems.github.com
  - SHELL PATH:
     - /Users/scott/.rvm/gems/ruby-2.2.2/bin
     - /Users/scott/.rvm/gems/ruby-2.2.2@global/bin
     - /Users/scott/.rvm/rubies/ruby-2.2.2/bin
     - /usr/local/bin
     - /usr/bin
     - /bin
     - /usr/sbin
     - /sbin
     - /opt/X11/bin
     - /Users/scott/.rvm/bin
     - /Users/scott/.composer/vendor/bin
     - /usr/local/sbin

现在这是我不断收到各种命令的错误消息（这特别来自 brew services start httpd22）：

Error: ERROR: Failed to build gem native extension.

    /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/bin/ruby extconf.rb
Extracting libxml2-2.8.0.tar.gz into tmp/x86_64-apple-darwin14.3.0/ports/libxml2/2.8.0... OK
Running 'compile' for libxml2 2.8.0... ERROR, review 'tmp/x86_64-apple-darwin14.3.0/ports/libxml2/2.8.0/compile.log' to see what happened.
/Library/Ruby/Gems/2.0.0/gems/mini_portile-0.5.2/lib/mini_portile.rb:265:in `block in execute': Failed to complete compile task (RuntimeError)
    from /Library/Ruby/Gems/2.0.0/gems/mini_portile-0.5.2/lib/mini_portile.rb:257:in `chdir'
    from /Library/Ruby/Gems/2.0.0/gems/mini_portile-0.5.2/lib/mini_portile.rb:257:in `execute'
    from /Library/Ruby/Gems/2.0.0/gems/mini_portile-0.5.2/lib/mini_portile.rb:69:in `compile'
    from /Library/Ruby/Gems/2.0.0/gems/mini_portile-0.5.2/lib/mini_portile.rb:109:in `cook'
    from extconf.rb:101:in `block in <main>'
    from extconf.rb:119:in `call'
    from extconf.rb:119:in `block in <main>'
    from extconf.rb:109:in `tap'
    from extconf.rb:109:in `<main>'

extconf failed, exit code 1

Gem files will remain installed in /Library/Ruby/Gems/2.0.0/gems/nokogiri-1.6.1 for inspection.
Results logged to /Library/Ruby/Gems/2.0.0/extensions/universal-darwin-14/2.0.0/nokogiri-1.6.1/gem_make.out

看看 Ruby & Gems 的系统版本怎么样？我已经安装了 XCode 并且是最新的。

brew doctor 没有结果，brew update 可以酿造。

我正在使用 OS 10.10.3。有什么我遗漏的，尽管问。

编辑

这是我的 .zshrc $PATH 导出：

export PATH="$PATH:$HOME/.composer/vendor/bin"
export PATH="$PATH:/usr/local/sbin"
export PATH="$PATH:$HOME/.rvm/bin"

编辑 2

$GEM_HOME

/Users/scott/.rvm/gems/ruby-2.2.2

$GEM_PATH

/Users/scott/.rvm/gems/ruby-2.2.2:/Users/scott/.rvm/gems/ruby-2.2.2@global

想法？

Answer 1

看着酿造：

https://github.com/Homebrew/homebrew/blob/master/bin/brew

https://github.com/Homebrew/homebrew/blob/master/bin/brew#L22

所以 brew 正在扰乱 GEM_PATH 并做自己的事情。

Answer 2

找到答案，系统 rubygems.rb 引用了错误版本的 Ruby。此处有更多详细信息：https://github.com/Homebrew/homebrew/issues/31220

Ruby gems 路径问题（系统与 brew）

Ruby gems path issue (system vs brew)

ruby

gem

homebrew