irb freezes my system, running a virtual machine on Oracle VirtualBox

I recently used pkg-install(8) to download Ruby and Ruby gems, then used gem install irb to install irb. But when I run irb, my system freezes - I can't ctrl-c my way out of it and I have to reset the virtual machine. The expected irb prompt does not appear. I can run irb -v and get the version number (1.6.2) - but actually running irb causes the aforementioned system freeze. I'm logged in as root. Help!
 
I would do a force reinstall, gem install likely overwrote some things. pkg install -f rubygem-irb.

Don't run gem install as root, you will overwrite whatever gets installed from packages/ports.
 
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