Cannot install any version of ruby on Mojave - internal ranlib command failed

Question

I know there are a few silimar issues to this one, but I cannot find one that matches my issue.

I cannot install any version of ruby with either rvm nor rbenv. Both

Answer 1

For those who find this and aren't helped by the above solution...

I ran into this issue as well. In my case it was due to MacPorts being outdated after I upgraded to (MacOS) Mojave.

I followed the steps listed on MacPorts' migration guide here: https://trac.macports.org/wiki/Migration

Closed and reopened Terminal (just b/c)

ran rvm install ruby and got Install of ruby-2.6.0 - #complete, hooray!