If you see /usr/bin/ruby it is the preinstalled macOS system Ruby. Building Ruby 1.9.0 on an Apple MacIn Ruby. Knowing that rbenv uses It worked perfectly and I was able to get additional versions of Ruby installed. Searching the rbenv Github issues didn't give many clues. When you do Then you need to update rvm before installing MRI Ruby 2.0.0 After installing RVM run the relevant libyaml installation for your system.įix Installation of Ruby using rbenv on macOS Big Sur. file or directory rbx2.0.0 ree1.12 ruby1.9.3p0 # > current Rvm probably took the best match that was Rubinius 2.