Hello,

Are you trying to install sass or other gems and your OS X El Crappytan is giving your troubles?

sudo gem install sass
ERROR:  While executing gem ... (Errno::EPERM)
Operation not permitted - /usr/bin/sass

simply run sudo gem install -n /usr/local/bin sass and that’s fixed.

Of course it works with any other gem that encounter this problem.

Have a good day!