Operation not permitted - /usr/bin/update_rubygems

Question

When I execute on osx El Capitan:

sudo gem update --system  

I got the error:

Updating rubygems-update
ERROR:  While execut         


        

Answer 1

ended up installing ruby via homebrew. Install homebrew first:

http://brew.sh

then execute

brew install ruby

after that it worked flawlessly. It has something to do with the native ruby installation.