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

I had this problem but only when I was starting tmux session using tmuxinator.

Turned out it's because I'm using tmuxinator from brew instead of installing it using gem install. Maybe using chruby at the same time contributed to the problem as well.

p/s: I also removed unused ruby from ~/.gem/ruby but I doubt that's the reason this issue was resolved for me.