Unable to build Elixir with Erlang OTP 21: 'cannot get bootfile','no_dot_erlang.boot'

Right. However the documentation about it is very scarce. Even when searching for the difference between these two packages there are only a lot of confusing online posts where nobody is sure. For example https://github.com/chef-cookbooks/erlang/issues/22#issuecomment-90544885 I think the official installation guide on Elixir also would result in installing the full package. Could you point to the relevant information about which packages to install?