Nerves install failing on Mac OS: "autoconf: command not found"

Hello,

While installing nerves on MacOS following the installation guide at Installation — nerves v1.14.3 I completed the MacOS section and then proceeded to the “All Platforms” section. Everything was going well until I hit the following step:

asdf install erlang 21.1

Where I keep getting the following error:

   === running autoconf in lib
    ./otp_build: line 319: autoconf: command not found
    make: *** No rule to make target `clean'.  Stop.
    <$HOME>/.asdf/plugins/erlang/kerl-home/builds/asdf_21.1/otp_src_21.1/configure  --cache-file=/dev/null --enable-darwin-64bit --with-ssl=/usr/local/opt/openssl
    ./otp_build: line 338: ./configure: is a directory

It is correct I do not have a program installed called “autoconf”. I should also note that I have already installed Elixir and Erlang versions prior to starting down the asdf installation path. (Not sure if that is a problem or not. It was not specified on the process to follow if there was pre-existing Elixir/Erlang setup).

Thanks