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

So, I think the fix to this was running:

$ sudo xcodebuild -runFirstLaunch

Why? I'm not sure. My suspicion is I tried to build ruby before updating XCode. But once I had updated XCode I suspect the wrong/older command line tool was still being referenced somehow.

I don't know exactly what fixed this but I completely deleted XCode and ruby still didn't install.

Then I completely deleted command line tools and ruby still didn't install.

Then I reinstalled just the command line tools without XCode and ruby still didn't install.

Then I ran this runFirstLaunch command and ruby installed.