(Arch Linux) Ruby missing 'erb'

[DVD-DAVIDE]

On Arch Linux, the default ruby package does not, for some reason, contain the erb class (or module/whatever it is called in ruby). It is instead in the separate package ruby-erb.

I believe the Arch install guide in the wiki should at least mention this, in order to avoid any issues one might have (as I did).

This was also mentioned here: rbenv/ruby-build#2518