用Homebrew装东西的时候，遇到的错误

Homebrew must be run under Ruby 2.3! (RuntimeError)

brew安装软件时ruby版本不符

解决方法：

升级到2.3（先查看当前ruby版本）

# 查看当前Ruby版本

ruby --version

ruby 2.0.0p481 (2014-05-08 revision 45883) [universal.x86_64-darwin14]

# 升级Ruby版本（此处是升级到2.3）

brew install [email protected]

Error: parent directory is world writable but not sticky

/System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/tmpdir.rb:92:in `mktmpdir'

/usr/local/Homebrew/Library/Homebrew/utils/fork.rb:6:in `safe_fork'

/usr/local/Homebrew/Library/Homebrew/formula_installer.rb:675:in `build'

/usr/local/Homebrew/Library/Homebrew/formula_installer.rb:306:in `install'

/usr/local/Homebrew/Library/Homebrew/formula_installer.rb:546:in `install_dependency'

/usr/local/Homebrew/Library/Homebrew/formula_installer.rb:513:in `block in install_dependencies'

/usr/local/Homebrew/Library/Homebrew/formula_installer.rb:513:in `each'

/usr/local/Homebrew/Library/Homebrew/formula_installer.rb:513:in `install_dependencies'

/usr/local/Homebrew/Library/Homebrew/formula_installer.rb:246:in `install'

/usr/local/Homebrew/Library/Homebrew/cmd/install.rb:341:in `install_formula'

/usr/local/Homebrew/Library/Homebrew/cmd/install.rb:226:in `block in install'

/usr/local/Homebrew/Library/Homebrew/cmd/install.rb:224:in `each'

/usr/local/Homebrew/Library/Homebrew/cmd/install.rb:224:in `install'

/usr/local/Homebrew/Library/Homebrew/brew.rb:95:in `

'

解决：sudo chmod +t /private/tmp/