ERROR: While executing gem … (Errno::EPERM) Operation not permitted [duplicate]

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I found the answer on SASS issues:
https://github.com/sass/sass/issues/1768

Since OSX el Capitan there is a new security function that prevents you from modifying system files called Rootless. So you have 2 options:

  • If you install gems on /usr/local/bin there will be no problem because rootless doesn’t affect this path.

  • sudo gem install -n /usr/local/bin GEM_NAME_HERE

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