Ignoring GEM because its extensions are not built

Question

On both my work and home computers, I recently upgraded Ruby to 2.3.1, using ruby-install. I use chruby as my Ruby switcher.

I started seei

Answer 1

If you are using rvm like me, the fix could a simple:

rvm get stable
rvm reload

As stated in this answer https://apple.stackexchange.com/a/192513