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cocoapods因GEM_HOME升级遇到问题解决办法

 
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Installing CocoaPods on OS X 10.11

These instructions were tested on all betas and the final release of El Capitan.

Custom GEM_HOME

This is the solution when you are receiving the "Operation not permitted" error.

$ mkdir -p $HOME/Software/ruby
$ export GEM_HOME=$HOME/Software/ruby
$ gem install cocoapods
[...]
1 gem installed
$ export PATH=$PATH:$HOME/Software/ruby/bin
$ pod --version
0.37.2
Standard system installation

For whatever reason, the rootless stuff seems less restrictive when one simply upgrades the system. I could sudo gem install cocoapods just fine on a machine upgraded from 10.10 - however, binstubs are no longer installed into /usr/bin:

$ sudo gem install cocoapods
[...]
1 gem installed
$ export PATH=$PATH:/Library/Ruby/bin
$ pod --version
0.37.2
We have heard from some users that they receive this error when doing a system-wide installation:

ERROR: While executing gem ... (Errno::EPERM)
Operation not permitted - /usr/bin/pod
We aren't sure why gem behaves differently on some systems, but this can be solved by passing -n /usr/local/bin to the install command, so that the pod executable gets installed there.

Note: I've locked the issue to collaborators so that these instructions don't get buried for now.
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