### Script

```shell
#!/bin/bash

yum install ncurses-devel openssl-devel -y
yum groupinstall "Development Tools" -y

cd /tmp
wget "http://erlang.org/download/otp_src_21.3.tar.gz" -O otp21.tar.gz
tar xfz otp21.tar.gz
cd otp_src_21.3/
./configure
make && make install

cd /tmp
wget "https://github.com/elixir-lang/elixir/archive/v1.8.1.tar.gz"
tar xfz v1.8.1.tar.gz
cd elixir-1.8.1/
export PATH="${PATH}:/usr/local/bin"
make && make install

mix local.hex --force
mix local.rebar --force
```

### Step-by-step Process

#### pre-install
    yum install ncurses-devel openssl-devel

#### install erlang
    wget "http://erlang.org/download/otp_src_21.3.tar.gz" -O otp21.tar.gz
    tar xfz otp21.tar.gz
    cd otp_src_21.3/
    ./configure
    make && make install

#### install elixir
    cd ..
    wget "https://github.com/elixir-lang/elixir/archive/v1.8.1.tar.gz"
    tar xfz v1.8.1.tar.gz
    cd elixir-1.8.1/
    export PATH="${PATH}:/usr/local/bin"
    make && make install

#### install deps
    mix local.hex --force
    mix local.rebar --force