How do you uninstall rbenv on macOS? My version of rbenv is messed up, and brew uninstall rbenv isn't working because brew relies on ruby.
I took these steps to successfully get rid of rbenv on my mac running El Capitan (10.11.4). Rbenv is a major cause of Failed to build gem native extension errors from my experience.
brew remove rbenv.rbenv directory: rm -rf ~/.rbenv.bash_profile file and delete any lines with rbenv in them: vi ~/.bash_profile.bashrc file and delete any lines with rbenv in them: vi ~/.bashrcFinally, reload .bash_profile and .bashrc:
. ~/.bash_profile && . ~/.bashrc
I think you should be able to uninstall rbenv by simply removing ~/.rbenv.
rm -rf ~/.rbenv
Or, if you installed rbenv via Homebrew, you can do
rm -rf `brew --prefix`/Cellar/rbenv