sudo gem install rhc fails on OSX El Capitan

[timmolter]

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

[timmolter]

Solution has to do with where Ruby installs gems:

On El Capitan you need to change where ruby installs gems using nano ~/.gemrc and adding gem: -n/usr/local/bin. source

[adcoolguy]

Or it you use rbenv, just do a ". ~/.bash_profile" and it would work.