lbadura/install_elixir.md

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    Elixir installation guide

Version numbers should be the ones you want. Here I do it with the last ones available at the moment of writing.
The simplest way to install elixir is using your package manager. Sadly, at the time of writing only Fedora shows
the intention to keep its packages up to date. There you can simply sudo dnf install erlang elixir and you are good to go.
Anyway, if you intend to work with several versions of erlang or elixir at the same time, or you are tied to
a specific version, you will need to compile it yourself. Then kerl and exenv are your best friends.
Install needed system packages

These packages are only needed if you intend to compile erlang yourself, or to work with several versions at a time.
If you just need some erlang installation, you can do it with your regular package manager. If that is your case,
then you may skip the kerl intallation process, and go straight to install exenv.
It will depend on your distribution that you have a version of erlang that is recent enough. For instance, on Fedora you
will probably have the last version released, but on Ubuntu you may have an older one.
Fedora

# install system build packages
sudo dnf install make automake gcc gcc-c++ kernel-devel git wget openssl-devel ncurses-devel wxBase3 wxGTK3-devel m4

# make wxWidgets3 visible to erlang (to build Erlang Observer)
mkdir -p ~/.local/bin
cd ~/.local/bin
ln -s /usr/bin/wx-config-3.0 wx-config
ln -s /usr/bin/wxrc-3.0 wxrc
Ubuntu

sudo aptitude install build-essential git wget libssl-dev libreadline-dev libncurses5-dev zlib1g-dev m4 curl wx-common libwxgtk3.0-dev
Arch

sudo pacman -S base-devel git curl wget wxgtk 
Install kerl

kerl lives in https://github.com/yrashk/kerl
# install kerl
mkdir -p ~/.local/bin
cd ~/.local/bin
curl -O https://raw.githubusercontent.com/spawngrid/kerl/master/kerl
chmod a+x kerl
cd

# just in case .local/bin is not in PATH, re-source will be needed
echo -e '\nPATH=$PATH:$HOME/.local/bin # Add custom bins to PATH' >> ~/.bashrc
echo -e '\nPATH=$PATH:$HOME/.local/bin # Add custom bins to PATH' >> ~/.bash_profile
On a new terminal:
kerl list releases
Build and install Erlang/OTP

# build erlang
kerl build 18.3 18.3

# install erlang
mkdir -p ~/.local/lib/erlang/18.3
kerl install 18.3 ~/.local/lib/erlang/18.3/

Add to .bashrc or .bash_profile:
# erlang custom runtime                                                             
test -s	"$HOME/.local/lib/erlang/18.3/activate"	&& source "$HOME/.local/lib/erlang/18.3/activate"
Now you can open a new terminal and try erl:
$ erl
Erlang/OTP 18 [erts-7.3] [source] [64-bit] [smp:4:4] [async-threads:10] [hipe] [kernel-poll:false]

Eshell V7.3  (abort with ^G)
1> 

Or start Erlang Observer by erl -s observer start.
Install exenv

exenv lives in https://github.com/mururu/exenv
git clone git://github.com/mururu/exenv.git .exenv
Add to .bashrc or .bash_profile:
# elixir custom runtime
export PATH="$HOME/.exenv/bin:$PATH"
test -s "$HOME/.exenv/bin/exenv" && eval "$(exenv init -)"
Build and install Elixir

Elixir lives in https://github.com/elixir-lang/elixir
In a new terminal:
# download and place elixir
wget https://github.com/elixir-lang/elixir/archive/v1.2.3.zip
unzip v1.2.3.zip
mv elixir-1.2.3/ .exenv/versions/1.2.3

# compile & test elixir
cd .exenv/versions/1.2.3
make clean test

# setup global default elixir
exenv rehash
exenv global 1.2.3
Now you can try 'iex':
$ iex
Erlang/OTP 18 [erts-7.3] [source] [64-bit] [smp:4:4] [async-threads:10] [hipe] [kernel-poll:false]

Interactive Elixir (1.2.3) - press Ctrl+C to exit (type h() ENTER for help)
iex(1)>