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brew update失败提示:/System/Library/Frameworks/Ruby.framework/的解决方法

想用brew安装wget,但是提示失败,然后想先 brew update,然后再重新试一下,结果在brew update后出现了这个情况:

$ brew update
/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 -- mach (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/extend/pathname.rb:2:in `'
    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:3:in `'
    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 `'

不管执行什么brew命令提示依旧,这种情况多发生在 El Capitan系统上,原因大概是更新失败,下面是stackoverflow找到的答案,亲测有效:

The problem mainly occurs after updating OS X to El Capitan (OS X 10.11). This is mainly because of file permission issues with file El Capitan’s new SIP process. Try changing permissions of/usr/local directory.

sudo chown -R $(whoami):admin /usr/local

如果运行完上面的命令还没有起作用的话,那么再运行下面的命令应该就可以了。这可能是因为homebrew还没有升级的原因。

  • 1. 首先打开终端
    2. $ cd /usr/local  
    3. $ git reset --hard  
    4. $ git clean -df
    5. $ brew update

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