我运行时遇到错误brew在终端中：
/System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/rubygems/core_ext/kernel_require.rb:55:in `require': cannot load such file -- utils/popen (LoadError)
from /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/rubygems/core_ext/kernel_require.rb:55:in `require'
from /usr/local/Library/Homebrew/utils.rb:6:in `<top (required)>'
from /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/rubygems/core_ext/kernel_require.rb:55:in `require'
from /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/rubygems/core_ext/kernel_require.rb:55:in `require'
from /usr/local/Library/Homebrew/global.rb:9:in `<top (required)>'
from /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/rubygems/core_ext/kernel_require.rb:55:in `require'
from /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/rubygems/core_ext/kernel_require.rb:55:in `require'
from /usr/local/Library/brew.rb:16:in `<main>'
这些是我的宝石设置：
- RUBYGEMS VERSION: 2.0.14
- RUBY VERSION: 2.0.0 (2014-02-24 patchlevel 451) [universal.x86_64-darwin13]
- INSTALLATION DIRECTORY: /Library/Ruby/Gems/2.0.0
- RUBY EXECUTABLE: /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/bin/ruby
- EXECUTABLE DIRECTORY: /usr/bin
- RUBYGEMS PLATFORMS:
- ruby
- universal-darwin-13
- GEM PATHS:
- /Library/Ruby/Gems/2.0.0
- /Users/ronaldkwan/.gem/ruby/2.0.0
- /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/gems/2.0.0
- GEM CONFIGURATION:
- :update_sources => true
- :verbose => true
- :backtrace => false
- :bulk_threshold => 1000
原答案
该问题主要发生在将 OS X 更新到 El Capitan (OS X 10.11) 或 macOS Sierra (macOS 10.12) 后。
这是因为 El Capitan 或更高版本 macOS 的文件权限问题新的SIP流程 http://coolestguidesontheplanet.com/what-is-sip-in-osx-10-11-el-capitan/。尝试更改权限/usr/local目录：
$ sudo chown -R $(whoami):admin /usr/local
如果仍然不起作用，请在终端会话中使用以下步骤，一切都会好起来的：
cd /usr/local/Homebrew
git reset --hard origin/master
brew update
If /usr/local/Library/Homebrew不起作用，尝试一下/usr/local/Homebrew。问题可能是 Homebrew 已经过时了。
2021 年 4 月更新
上面的命令不适用于 macOS High Sierra 或更高版本，如本中所述GitHub问题 https://github.com/Homebrew/brew/issues/3228#issuecomment-332679274。你必须运行这个：
sudo chown -R $(whoami) $(brew --prefix)/*
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